diff --git a/.github/workflows/build-debug.yml b/.github/workflows/build-debug.yml
new file mode 100644
index 0000000..a1a5166
--- /dev/null
+++ b/.github/workflows/build-debug.yml
@@ -0,0 +1,251 @@
+name: build-debug
+
+on:
+  workflow_dispatch:
+    inputs:
+      loopCount:
+        required: true
+        type: number
+        defualt: 10
+
+env:
+  TEST_SIGNALING_URLS: ${{ secrets.TEST_SIGNALING_URLS }}
+  TEST_CHANNEL_ID_PREFIX: ${{ secrets.TEST_CHANNEL_ID_PREFIX }}
+  TEST_SECRET_KEY: ${{ secrets.TEST_SECRET_KEY }}
+  TEST_API_URL: ${{ secrets.TEST_API_URL }}
+
+jobs:
+  build-linux:
+    strategy:
+      fail-fast: false
+      matrix:
+        platform:
+          - name: ubuntu-24.04_x86_64
+            runs-on: ubuntu-24.04
+        python:
+          - version: "3.10"
+          - version: "3.11"
+          - version: "3.12"
+          - version: "3.13"
+    runs-on: ${{ matrix.platform.runs-on }}
+    steps:
+      - name: Disk Cleanup
+        run: |
+          set -x
+          df -h
+          # sudo du -h -d1 /usr/local
+          # sudo du -h -d1 /usr/local/share
+          # sudo du -h -d1 /usr/local/lib
+          # sudo du -h -d1 /usr/share
+          RMI=`docker images -q -a`
+          if [ -n "$RMI" ]; then
+            docker rmi $RMI
+          fi
+          # 4.6G
+          sudo rm -rf /usr/local/.ghcup
+          # 1.7G
+          sudo rm -rf /usr/share/swift
+          # 1.4G
+          sudo rm -rf /usr/share/dotnet
+          # 13G
+          sudo rm -rf /usr/local/lib/android
+          df -h
+      - name: Get stats
+        run: |
+          set -x
+          cat /etc/lsb-release
+          uname -a
+          cat /proc/cpuinfo
+          cat /proc/meminfo
+      - name: Setup Git User
+        run: |
+          git config --global user.name  "${{ github.actor }}"
+          git config --global user.email "${{ github.actor }}@users.noreply.github.com"
+
+      - name: Setup common
+        run: |
+          # clang-18
+          wget https://apt.llvm.org/llvm.sh
+          chmod a+x llvm.sh
+          sudo ./llvm.sh 18
+
+      - uses: actions/checkout@v4
+        with:
+          path: sora-python-sdk
+      - name: Get versions
+        id: version
+        run: |
+          source sora-python-sdk/VERSION
+          echo "webrtc_build_version=${WEBRTC_BUILD_VERSION}" >> $GITHUB_OUTPUT
+          echo "sora_cpp_sdk_version=${SORA_CPP_SDK_VERSION}" >> $GITHUB_OUTPUT
+          echo "boost_version=${BOOST_VERSION}" >> $GITHUB_OUTPUT
+
+      # libwebrtc
+      - uses: actions/cache@v4
+        id: webrtc-build-cache
+        with:
+          path: webrtc-build/_package/${{ matrix.platform.name }}/webrtc
+          key: webrtc-build-${{ matrix.platform.name }}-${{ steps.version.outputs.webrtc_build_version }}
+      - uses: actions/checkout@v4
+        if: steps.webrtc-build-cache.outputs.cache-hit != 'true'
+        with:
+          path: webrtc-build
+          repository: shiguredo-webrtc-build/webrtc-build
+          ref: ${{ steps.version.outputs.webrtc_build_version }}
+      - name: Setup libwebrtc
+        if: steps.webrtc-build-cache.outputs.cache-hit != 'true'
+        run: |
+          sudo bash -c '
+            set -ex
+            apt-get -y install tzdata
+            echo "Asia/Tokyo" > /etc/timezone
+            dpkg-reconfigure -f noninteractive tzdata
+            export DEBIAN_FRONTEND=noninteractive
+            apt-get -y install \
+              binutils \
+              git \
+              locales \
+              lsb-release \
+              ninja-build \
+              pkg-config \
+              python3 \
+              python3-setuptools \
+              rsync \
+              sudo \
+              unzip \
+              vim \
+              wget \
+              xz-utils
+          '
+      - name: Build libwebrtc
+        if: steps.webrtc-build-cache.outputs.cache-hit != 'true'
+        working-directory: webrtc-build
+        run: |
+          python3 run.py build --debug ${{ matrix.platform.name }}
+          python3 run.py package --debug ${{ matrix.platform.name }}
+
+      # sora-cpp-sdk
+      - uses: actions/cache@v4
+        id: sora-cpp-sdk-cache
+        with:
+          path: sora-cpp-sdk/_install/${{ matrix.platform.name }}/debug/sora
+          key: sora-cpp-sdk-${{ matrix.platform.name }}-${{ steps.version.outputs.sora_cpp_sdk_version }}
+      - uses: actions/cache@v4
+        id: boost-cache
+        with:
+          path: sora-cpp-sdk/_install/${{ matrix.platform.name }}/debug/boost
+          key: boost-${{ matrix.platform.name }}-${{ steps.version.outputs.sora_cpp_sdk_version }}
+      - uses: actions/checkout@v4
+        if: steps.sora-cpp-sdk-cache.outputs.cache-hit != 'true'
+        with:
+          path: sora-cpp-sdk
+          repository: shiguredo/sora-cpp-sdk
+          ref: ${{ steps.version.outputs.sora_cpp_sdk_version }}
+      # Ubuntu 24.04 だと libtinfo5 が見つからない問題があるので、その修正
+      # ref: https://qiita.com/gengen16k/items/88cf3c18a40a94205fab
+      - name: Fix CUDA issues for Ubuntu 24.04
+        if: steps.sora-cpp-sdk-cache.outputs.cache-hit != 'true' && matrix.platform.name == 'ubuntu-24.04_x86_64'
+        run: |
+          sudo tee /etc/apt/sources.list.d/jammy.list << EOF
+          deb http://archive.ubuntu.com/ubuntu/ jammy universe
+          EOF
+
+          sudo tee /etc/apt/preferences.d/pin-jammy <<EOF
+          Package: *
+          Pin: release n=jammy
+          Pin-Priority: -10
+
+          Package: libtinfo5
+          Pin: release n=jammy
+          Pin-Priority: 990
+          EOF
+      - name: Setup sora-cpp-sdk
+        if: steps.sora-cpp-sdk-cache.outputs.cache-hit != 'true'
+        working-directory: sora-cpp-sdk
+        run: |
+          source VERSION
+          sudo apt-get update
+          sudo apt-get install -y software-properties-common
+
+          # X11
+          sudo apt-get install libx11-dev libxext-dev
+
+          # CUDA
+          wget http://archive.ubuntu.com/ubuntu/pool/main/o/openssl/libssl1.1_1.1.0g-2ubuntu4_amd64.deb
+          sudo dpkg -i libssl1.1_1.1.0g-2ubuntu4_amd64.deb
+          wget https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2004/x86_64/cuda-keyring_1.0-1_all.deb
+          sudo dpkg -i cuda-keyring_*all.deb
+          sudo apt-get update
+          DEBIAN_FRONTEND=noninteractive sudo apt-get -y install cuda=$CUDA_VERSION
+
+          # Intel Media SDK のために libva-dev, libdrm-dev を入れる
+          DEBIAN_FRONTEND=noninteractive sudo apt-get -y install libva-dev libdrm-dev
+      - name: Copy libwebrtc to sora-cpp-sdk
+        if: steps.sora-cpp-sdk-cache.outputs.cache-hit != 'true'
+        run: |
+          mkdir -p sora-cpp-sdk/_install/${{ matrix.platform.name }}/debug
+          cp -r webrtc-build/_package/${{ matrix.platform.name }}/webrtc sora-cpp-sdk/_install/${{ matrix.platform.name }}/debug/webrtc
+          echo ${{ steps.version.outputs.webrtc_build_version }} > sora-cpp-sdk/_install/${{ matrix.platform.name }}/debug/webrtc.version
+      - name: Build sora-cpp-sdk
+        if: steps.sora-cpp-sdk-cache.outputs.cache-hit != 'true'
+        working-directory: sora-cpp-sdk
+        run: python3 run.py --debug ${{ matrix.platform.name }}
+
+      # sora-python-sdk
+      - name: Setup sora-python-sdk
+        run: |
+          sudo apt-get update
+          sudo apt-get -y install libva2 libdrm2 libva-dev libdrm-dev libx11-dev portaudio19-dev
+
+          # Download OpneH264
+          curl -LO http://ciscobinary.openh264.org/libopenh264-2.4.1-linux64.7.so.bz2
+          bzip2 -d libopenh264-2.4.1-linux64.7.so.bz2
+          mv libopenh264-2.4.1-linux64.7.so libopenh264.so
+          echo "OPENH264_PATH=`pwd`/libopenh264.so" >> $GITHUB_ENV
+      - name: Copy libwebrtc to sora-python-sdk
+        run: |
+          mkdir -p sora-python-sdk/_install/${{ matrix.platform.name }}/debug
+          cp -r webrtc-build/_package/${{ matrix.platform.name }}/webrtc sora-python-sdk/_install/${{ matrix.platform.name }}/webrtc
+          echo ${{ steps.version.outputs.webrtc_build_version }} > sora-python-sdk/_install/${{ matrix.platform.name }}/webrtc.version
+      - name: Copy sora-cpp-sdk to sora-python-sdk
+        run: |
+          mkdir -p sora-python-sdk/_install/${{ matrix.platform.name }}/debug
+          cp -r sora-cpp-sdk/_install/${{ matrix.platform.name }}/debug/sora sora-python-sdk/_install/${{ matrix.platform.name }}/sora
+          echo ${{ steps.version.outputs.sora_cpp_sdk_version }} > sora-python-sdk/_install/${{ matrix.platform.name }}/sora.version
+      - name: Copy boost to sora-python-sdk
+        run: |
+          mkdir -p sora-python-sdk/_install/${{ matrix.platform.name }}/debug
+          cp -r sora-cpp-sdk/_install/${{ matrix.platform.name }}/debug/boost sora-python-sdk/_install/${{ matrix.platform.name }}/boost
+          echo ${{ steps.version.outputs.boost_version }} > sora-python-sdk/_install/${{ matrix.platform.name }}/boost.version
+      - uses: actions/cache@v4
+        id: llvm-cache
+        with:
+          path: sora-python-sdk/_install/${{ matrix.platform.name }}/llvm
+          key: llvm-${{ matrix.platform.name }}-${{ steps.version.outputs.sora_cpp_sdk }}
+      - uses: actions/cache@v4
+        id: version-file-cache
+        with:
+          path: versions
+          key: versions-${{ matrix.platform.name }}-${{ steps.version.outputs.sora_cpp_sdk }}
+      - name: Copy version file
+        if: steps.version-file-cache.outputs.cache-hit == 'true'
+        run: cp versions/llvm.version sora-python-sdk/_install/${{ matrix.platform.name }}/
+      - uses: astral-sh/setup-uv@v3
+      - name: Build sora-python-sdk
+        working-directory: sora-python-sdk
+        run: |
+          set -x
+          uv python pin ${{ matrix.python.version }}
+          uv sync
+          uv run python run.py --debug ${{ matrix.platform.name }}
+          # cache
+          mkdir -p ../versions
+          cp _install/${{ matrix.platform.name }}/llvm.version ../versions
+      - name: E2E Test sora-python-sdk
+        working-directory: sora-python-sdk
+        run: |
+          for i in {1..${{ inputs.loopCount || 10 }}}; do
+            echo "---------------- $i 回目 ----------------"
+            sleep 10
+            lldb-18 --batch -o 'command script import test_with_llvm.py' -o 'test'
+          done
diff --git a/.github/workflows/build-relwithdebinfo.yml b/.github/workflows/build-relwithdebinfo.yml
new file mode 100644
index 0000000..b5db9c3
--- /dev/null
+++ b/.github/workflows/build-relwithdebinfo.yml
@@ -0,0 +1,202 @@
+name: build-relwithdebinfo
+
+on:
+  workflow_dispatch:
+    inputs:
+      loopCount:
+        required: true
+        type: number
+        defualt: 10
+
+env:
+  TEST_SIGNALING_URLS: ${{ secrets.TEST_SIGNALING_URLS }}
+  TEST_CHANNEL_ID_PREFIX: ${{ secrets.TEST_CHANNEL_ID_PREFIX }}
+  TEST_SECRET_KEY: ${{ secrets.TEST_SECRET_KEY }}
+  TEST_API_URL: ${{ secrets.TEST_API_URL }}
+
+jobs:
+  build-linux:
+    strategy:
+      fail-fast: false
+      matrix:
+        platform:
+          - name: ubuntu-24.04_x86_64
+            runs-on: ubuntu-24.04
+        python:
+          - version: "3.10"
+          - version: "3.11"
+          - version: "3.12"
+          - version: "3.13"
+    runs-on: ${{ matrix.platform.runs-on }}
+    steps:
+      - name: Disk Cleanup
+        run: |
+          set -x
+          df -h
+          # sudo du -h -d1 /usr/local
+          # sudo du -h -d1 /usr/local/share
+          # sudo du -h -d1 /usr/local/lib
+          # sudo du -h -d1 /usr/share
+          RMI=`docker images -q -a`
+          if [ -n "$RMI" ]; then
+            docker rmi $RMI
+          fi
+          # 4.6G
+          sudo rm -rf /usr/local/.ghcup
+          # 1.7G
+          sudo rm -rf /usr/share/swift
+          # 1.4G
+          sudo rm -rf /usr/share/dotnet
+          # 13G
+          sudo rm -rf /usr/local/lib/android
+          df -h
+      - name: Get stats
+        run: |
+          set -x
+          cat /etc/lsb-release
+          uname -a
+          cat /proc/cpuinfo
+          cat /proc/meminfo
+      - name: Setup Git User
+        run: |
+          git config --global user.name  "${{ github.actor }}"
+          git config --global user.email "${{ github.actor }}@users.noreply.github.com"
+
+      - name: Setup common
+        run: |
+          # clang-18
+          wget https://apt.llvm.org/llvm.sh
+          chmod a+x llvm.sh
+          sudo ./llvm.sh 18
+
+      - uses: actions/checkout@v4
+        with:
+          path: sora-python-sdk
+      - name: Get versions
+        id: version
+        run: |
+          source sora-python-sdk/VERSION
+          echo "webrtc_build_version=${WEBRTC_BUILD_VERSION}" >> $GITHUB_OUTPUT
+          echo "sora_cpp_sdk_version=${SORA_CPP_SDK_VERSION}" >> $GITHUB_OUTPUT
+          echo "boost_version=${BOOST_VERSION}" >> $GITHUB_OUTPUT
+
+      # sora-cpp-sdk
+      - uses: actions/cache@v4
+        id: sora-cpp-sdk-cache
+        with:
+          path: sora-cpp-sdk/_install/${{ matrix.platform.name }}/release/sora
+          key: sora-cpp-sdk-${{ matrix.platform.name }}-${{ steps.version.outputs.sora_cpp_sdk_version }}-relwithdebinfo
+      - uses: actions/cache@v4
+        id: boost-cache
+        with:
+          path: sora-cpp-sdk/_install/${{ matrix.platform.name }}/release/boost
+          key: boost-${{ matrix.platform.name }}-${{ steps.version.outputs.sora_cpp_sdk_version }}-relwithdebinfo
+      - uses: actions/checkout@v4
+        if: steps.sora-cpp-sdk-cache.outputs.cache-hit != 'true'
+        with:
+          path: sora-cpp-sdk
+          repository: shiguredo/sora-cpp-sdk
+          ref: ${{ steps.version.outputs.sora_cpp_sdk_version }}
+      # Ubuntu 24.04 だと libtinfo5 が見つからない問題があるので、その修正
+      # ref: https://qiita.com/gengen16k/items/88cf3c18a40a94205fab
+      - name: Fix CUDA issues for Ubuntu 24.04
+        if: steps.sora-cpp-sdk-cache.outputs.cache-hit != 'true' && matrix.platform.name == 'ubuntu-24.04_x86_64'
+        run: |
+          sudo tee /etc/apt/sources.list.d/jammy.list << EOF
+          deb http://archive.ubuntu.com/ubuntu/ jammy universe
+          EOF
+
+          sudo tee /etc/apt/preferences.d/pin-jammy <<EOF
+          Package: *
+          Pin: release n=jammy
+          Pin-Priority: -10
+
+          Package: libtinfo5
+          Pin: release n=jammy
+          Pin-Priority: 990
+          EOF
+      - name: Setup sora-cpp-sdk
+        if: steps.sora-cpp-sdk-cache.outputs.cache-hit != 'true'
+        working-directory: sora-cpp-sdk
+        run: |
+          source VERSION
+          sudo apt-get update
+          sudo apt-get install -y software-properties-common
+
+          # X11
+          sudo apt-get install -y libx11-dev libxext-dev
+
+          # CUDA
+          wget http://archive.ubuntu.com/ubuntu/pool/main/o/openssl/libssl1.1_1.1.0g-2ubuntu4_amd64.deb
+          sudo dpkg -i libssl1.1_1.1.0g-2ubuntu4_amd64.deb
+          wget https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2004/x86_64/cuda-keyring_1.0-1_all.deb
+          sudo dpkg -i cuda-keyring_*all.deb
+          sudo apt-get update
+          DEBIAN_FRONTEND=noninteractive sudo apt-get -y install cuda=$CUDA_VERSION
+
+          # Intel Media SDK のために libva-dev, libdrm-dev を入れる
+          DEBIAN_FRONTEND=noninteractive sudo apt-get -y install libva-dev libdrm-dev
+      - name: Build sora-cpp-sdk
+        if: steps.sora-cpp-sdk-cache.outputs.cache-hit != 'true'
+        working-directory: sora-cpp-sdk
+        run: python3 run.py --relwithdebinfo ${{ matrix.platform.name }}
+      - name: Teardown sora-cpp-sdk
+        if: steps.sora-cpp-sdk-cache.outputs.cache-hit != 'true'
+        run: |
+          # CUDA が入ってると使おうとしてエラーになるのでアンインストールしておく
+          sudo apt-get remove -y cuda
+          sudo apt-get autoremove -y
+
+      # sora-python-sdk
+      - name: Setup sora-python-sdk
+        run: |
+          sudo apt-get update
+          sudo apt-get -y install libva2 libdrm2 libva-dev libdrm-dev libx11-dev portaudio19-dev
+
+          # Download OpneH264
+          curl -LO http://ciscobinary.openh264.org/libopenh264-2.4.1-linux64.7.so.bz2
+          bzip2 -d libopenh264-2.4.1-linux64.7.so.bz2
+          mv libopenh264-2.4.1-linux64.7.so libopenh264.so
+          echo "OPENH264_PATH=`pwd`/libopenh264.so" >> $GITHUB_ENV
+      - name: Copy sora-cpp-sdk to sora-python-sdk
+        run: |
+          mkdir -p sora-python-sdk/_install/${{ matrix.platform.name }}/release
+          cp -r sora-cpp-sdk/_install/${{ matrix.platform.name }}/release/sora sora-python-sdk/_install/${{ matrix.platform.name }}/sora
+          echo ${{ steps.version.outputs.sora_cpp_sdk_version }} > sora-python-sdk/_install/${{ matrix.platform.name }}/sora.version
+      - name: Copy boost to sora-python-sdk
+        run: |
+          mkdir -p sora-python-sdk/_install/${{ matrix.platform.name }}/release
+          cp -r sora-cpp-sdk/_install/${{ matrix.platform.name }}/release/boost sora-python-sdk/_install/${{ matrix.platform.name }}/boost
+          echo ${{ steps.version.outputs.boost_version }} > sora-python-sdk/_install/${{ matrix.platform.name }}/boost.version
+      - uses: actions/cache@v4
+        id: llvm-cache
+        with:
+          path: sora-python-sdk/_install/${{ matrix.platform.name }}/llvm
+          key: llvm-${{ matrix.platform.name }}-${{ steps.version.outputs.sora_cpp_sdk }}
+      - uses: actions/cache@v4
+        id: version-file-cache
+        with:
+          path: versions
+          key: versions-${{ matrix.platform.name }}-${{ steps.version.outputs.sora_cpp_sdk }}
+      - name: Copy version file
+        if: steps.version-file-cache.outputs.cache-hit == 'true'
+        run: cp versions/llvm.version sora-python-sdk/_install/${{ matrix.platform.name }}/
+      - uses: astral-sh/setup-uv@v3
+      - name: Build sora-python-sdk
+        working-directory: sora-python-sdk
+        run: |
+          set -x
+          uv python pin ${{ matrix.python.version }}
+          uv sync
+          uv run python run.py --relwithdebinfo ${{ matrix.platform.name }}
+          # cache
+          mkdir -p ../versions
+          cp _install/${{ matrix.platform.name }}/llvm.version ../versions
+      - name: E2E Test sora-python-sdk
+        working-directory: sora-python-sdk
+        run: |
+          for i in {1..${{ inputs.loopCount || 10 }}}; do
+            echo "---------------- $i 回目 ----------------"
+            sleep 10
+            lldb-18 --batch -o 'command script import test_with_llvm.py' -o 'test'
+          done
diff --git a/run.py b/run.py
index e054a37..3bc6a79 100644
--- a/run.py
+++ b/run.py
@@ -226,7 +226,11 @@ def main():
             args.local_sora_cpp_sdk_args,
         )
 
-        configuration = "Debug" if args.debug else "Release"
+        configuration = "Release"
+        if args.debug:
+            configuration = "Debug"
+        if args.relwithdebinfo:
+            configuration = "RelWithDebInfo"
 
         webrtc_platform = get_webrtc_platform(platform)
         webrtc_info = get_webrtc_info(
diff --git a/src/sora_sdk_ext.cpp b/src/sora_sdk_ext.cpp
index 41237dc..b08b029 100644
--- a/src/sora_sdk_ext.cpp
+++ b/src/sora_sdk_ext.cpp
@@ -30,6 +30,10 @@ using namespace nb::literals;
  * やっておかないと終了時にリークエラーが発生する。
  */
 int audio_sink_tp_traverse(PyObject* self, visitproc visit, void* arg) {
+  if (!nb::inst_ready(self)) {
+    return 0;
+  }
+
   // インスタンスを取得する
   SoraAudioSinkImpl* audio_sink = nb::inst_ptr<SoraAudioSinkImpl>(self);
 
@@ -51,6 +55,10 @@ int audio_sink_tp_traverse(PyObject* self, visitproc visit, void* arg) {
 }
 
 int audio_sink_tp_clear(PyObject* self) {
+  if (!nb::inst_ready(self)) {
+    return 0;
+  }
+
   SoraAudioSinkImpl* audio_sink = nb::inst_ptr<SoraAudioSinkImpl>(self);
   audio_sink->on_format_ = nullptr;
   audio_sink->on_data_ = nullptr;
@@ -67,6 +75,10 @@ PyType_Slot audio_sink_slots[] = {
     {0, nullptr}};
 
 int audio_stream_sink_tp_traverse(PyObject* self, visitproc visit, void* arg) {
+  if (!nb::inst_ready(self)) {
+    return 0;
+  }
+
   SoraAudioStreamSinkImpl* audio_sink =
       nb::inst_ptr<SoraAudioStreamSinkImpl>(self);
 
@@ -79,6 +91,10 @@ int audio_stream_sink_tp_traverse(PyObject* self, visitproc visit, void* arg) {
 }
 
 int audio_stream_sink_tp_clear(PyObject* self) {
+  if (!nb::inst_ready(self)) {
+    return 0;
+  }
+
   SoraAudioStreamSinkImpl* audio_sink =
       nb::inst_ptr<SoraAudioStreamSinkImpl>(self);
   audio_sink->on_frame_ = nullptr;
@@ -91,6 +107,10 @@ PyType_Slot audio_stream_sink_slots[] = {
     {0, nullptr}};
 
 int video_sink_tp_traverse(PyObject* self, visitproc visit, void* arg) {
+  if (!nb::inst_ready(self)) {
+    return 0;
+  }
+
   SoraVideoSinkImpl* video_sink = nb::inst_ptr<SoraVideoSinkImpl>(self);
 
   if (video_sink->on_frame_) {
@@ -102,6 +122,10 @@ int video_sink_tp_traverse(PyObject* self, visitproc visit, void* arg) {
 }
 
 int video_sink_tp_clear(PyObject* self) {
+  if (!nb::inst_ready(self)) {
+    return 0;
+  }
+
   SoraVideoSinkImpl* video_sink = nb::inst_ptr<SoraVideoSinkImpl>(self);
   video_sink->on_frame_ = nullptr;
   return 0;
@@ -115,6 +139,10 @@ PyType_Slot video_sink_slots[] = {
 int audio_frame_transformer_tp_traverse(PyObject* self,
                                         visitproc visit,
                                         void* arg) {
+  if (!nb::inst_ready(self)) {
+    return 0;
+  }
+
   SoraAudioFrameTransformer* audio_frame_transformer =
       nb::inst_ptr<SoraAudioFrameTransformer>(self);
 
@@ -127,6 +155,10 @@ int audio_frame_transformer_tp_traverse(PyObject* self,
 }
 
 int audio_frame_transformer_tp_clear(PyObject* self) {
+  if (!nb::inst_ready(self)) {
+    return 0;
+  }
+
   SoraAudioFrameTransformer* audio_frame_transformer =
       nb::inst_ptr<SoraAudioFrameTransformer>(self);
   audio_frame_transformer->on_transform_ = nullptr;
@@ -141,6 +173,10 @@ PyType_Slot audio_frame_transformer_slots[] = {
 int video_frame_transformer_tp_traverse(PyObject* self,
                                         visitproc visit,
                                         void* arg) {
+  if (!nb::inst_ready(self)) {
+    return 0;
+  }
+
   SoraVideoFrameTransformer* video_frame_transformer =
       nb::inst_ptr<SoraVideoFrameTransformer>(self);
 
@@ -153,6 +189,10 @@ int video_frame_transformer_tp_traverse(PyObject* self,
 }
 
 int video_frame_transformer_tp_clear(PyObject* self) {
+  if (!nb::inst_ready(self)) {
+    return 0;
+  }
+
   SoraVideoFrameTransformer* video_frame_transformer =
       nb::inst_ptr<SoraVideoFrameTransformer>(self);
   video_frame_transformer->on_transform_ = nullptr;
@@ -165,6 +205,10 @@ PyType_Slot video_frame_transformer_slots[] = {
     {0, nullptr}};
 
 int connection_tp_traverse(PyObject* self, visitproc visit, void* arg) {
+  if (!nb::inst_ready(self)) {
+    return 0;
+  }
+
   SoraConnection* conn = nb::inst_ptr<SoraConnection>(self);
 
   if (conn->on_set_offer_) {
@@ -221,6 +265,10 @@ int connection_tp_traverse(PyObject* self, visitproc visit, void* arg) {
 }
 
 int connection_tp_clear(PyObject* self) {
+  if (!nb::inst_ready(self)) {
+    return 0;
+  }
+
   SoraConnection* conn = nb::inst_ptr<SoraConnection>(self);
   conn->on_set_offer_ = nullptr;
   conn->on_ws_close_ = nullptr;
diff --git a/test_with_llvm.py b/test_with_llvm.py
new file mode 100644
index 0000000..77f28c6
--- /dev/null
+++ b/test_with_llvm.py
@@ -0,0 +1,39 @@
+import sys
+import time
+
+import lldb
+
+
+def test(debugger, command, result, internal_dict):
+    debugger.HandleCommand("settings set target.process.follow-fork-mode child")
+
+    target = debugger.CreateTargetWithFileAndArch("uv", lldb.LLDB_ARCH_DEFAULT)
+    process = target.LaunchSimple(["run", "pytest", "tests", "-s"], None, None)
+
+    if not process:
+        print("Error: could not launch process")
+        return
+
+    while True:
+        time.sleep(1.0)
+        state = process.GetState()
+
+        if state == lldb.eStateExited:
+            exit_status = process.GetExitStatus()
+            # debugger.HandleCommand(f"exit {exit_status}")
+            # sys.exit(exit_status)
+            debugger.HandleCommand("exit 0")
+            sys.exit(0)
+        elif state == lldb.eStateStopped:
+            thread = process.GetSelectedThread()
+            if thread.GetStopReason() == lldb.eStopReasonExec:
+                process.Continue()
+                continue
+            debugger.HandleCommand("bt all")
+            debugger.HandleCommand("exit 1")
+            sys.exit(1)
+
+
+# LLDBにスクリプトを初期化してコマンドを追加
+def __lldb_init_module(debugger, internal_dict):
+    debugger.HandleCommand("command script add -f test_with_llvm.test test")