IllegalStateException without any useful details when trying to register endHandler

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2024-06-07 16:26:21.226 ERROR io.vertx.core.impl.ContextImpl - Unhandled exception
java.lang.IllegalStateException: null
	at io.vertx.core.http.impl.HttpClientResponseImpl.checkEnded(HttpClientResponseImpl.java:150) ~[vertx-core-4.5.1.jar:4.5.1]
	at io.vertx.core.http.impl.HttpClientResponseImpl.endHandler(HttpClientResponseImpl.java:172) ~[vertx-core-4.5.1.jar:4.5.1]
	at org.swisspush.gateleen.routing.Forwarder.lambda$getAsyncHttpClientResponseHandler$9(Forwarder.java:506) ~[gateleen-routing-2.1.8.jar:?]
	at io.vertx.core.impl.future.FutureImpl$4.onSuccess(FutureImpl.java:176) ~[vertx-core-4.5.1.jar:4.5.1]
	at io.vertx.core.impl.future.FutureBase.emitSuccess(FutureBase.java:66) ~[vertx-core-4.5.1.jar:4.5.1]
	at io.vertx.core.impl.future.FutureImpl.addListener(FutureImpl.java:231) ~[vertx-core-4.5.1.jar:4.5.1]
	at io.vertx.core.impl.future.FutureImpl.onComplete(FutureImpl.java:199) ~[vertx-core-4.5.1.jar:4.5.1]
	at io.vertx.core.http.impl.HttpClientRequestBase.response(HttpClientRequestBase.java:270) ~[vertx-core-4.5.1.jar:4.5.1]
	at io.vertx.core.http.HttpClientRequest.send(HttpClientRequest.java:392) ~[vertx-core-4.5.1.jar:4.5.1]
	at org.swisspush.gateleen.routing.Forwarder$1.lambda$handle$2(Forwarder.java:393) ~[gateleen-routing-2.1.8.jar:?]
	at org.swisspush.gateleen.core.http.BufferBridge.lambda$pump$0(BufferBridge.java:43) ~[gateleen-core-2.1.8.jar:?]
	at io.vertx.core.impl.ContextInternal.dispatch(ContextInternal.java:276) ~[vertx-core-4.5.1.jar:4.5.1]
	at io.vertx.core.impl.ContextInternal.dispatch(ContextInternal.java:258) ~[vertx-core-4.5.1.jar:4.5.1]
	at io.vertx.core.impl.ContextInternal.lambda$runOnContext$0(ContextInternal.java:56) ~[vertx-core-4.5.1.jar:4.5.1]
	at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:173) ~[netty-common-4.1.103.Final.jar:4.1.103.Final]
	at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:166) ~[netty-common-4.1.103.Final.jar:4.1.103.Final]
	at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:470) ~[netty-common-4.1.103.Final.jar:4.1.103.Final]
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:566) ~[netty-transport-4.1.103.Final.jar:4.1.103.Final]
	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997) ~[netty-common-4.1.103.Final.jar:4.1.103.Final]
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.103.Final.jar:4.1.103.Final]
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[netty-common-4.1.103.Final.jar:4.1.103.Final]
	at java.lang.Thread.run(Thread.java:829) ~[?:?]