diff --git a/packages/devtools/client/components/StateEditor.vue b/packages/devtools/client/components/StateEditor.vue
index fe86ca3a8..afbd75e06 100644
--- a/packages/devtools/client/components/StateEditor.vue
+++ b/packages/devtools/client/components/StateEditor.vue
@@ -55,7 +55,7 @@ function deepSync(from: any, to: any) {
   for (const key in fromValue) {
     if (Array.isArray(fromValue[key]))
       to[key] = fromValue[key].slice()
-    else if (typeof fromValue[key] === 'object')
+    else if (typeof fromValue[key] === 'object' && fromValue[key] !== null)
       deepSync(fromValue[key], to[key])
     else
       to[key] = fromValue[key]