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[Bug?] When Runtime initialization is interrupted by an exception, the _isInitialized flag is not cleared #2620

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[Bug?] When Runtime initialization is interrupted by an exception, the _isInitialized flag is not cleared#2620

Description

@SolarianZ
SolarianZ
opened on Sep 23, 2025

When calling PythonEngine.Initialize, an exception is occasionally encountered:

ArgumentException: An item with the same key has already been added. Key: missing type: GUITable`1+Col[T], Assembly-CSharp-Editor, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null
System.Collections.Generic.Dictionary`2[TKey,TValue].TryInsert (TKey key, TValue value, System.Collections.Generic.InsertionBehavior behavior) (at <eae584ce26bc40229c1b1aa476bfa589>:0)
System.Collections.Generic.Dictionary`2[TKey,TValue].Add (TKey key, TValue value) (at <eae584ce26bc40229c1b1aa476bfa589>:0)
System.Collections.Generic.Dictionary`2[TKey,TValue].OnDeserialization (System.Object sender) (at <eae584ce26bc40229c1b1aa476bfa589>:0)
System.Runtime.Serialization.ObjectManager.RaiseDeserializationEvent () (at <eae584ce26bc40229c1b1aa476bfa589>:0)
System.Runtime.Serialization.Formatters.Binary.ObjectReader.Deserialize (System.Runtime.Remoting.Messaging.HeaderHandler handler, System.Runtime.Serialization.Formatters.Binary.__BinaryParser serParser, System.Boolean fCheck, System.Boolean isCrossAppDomain, System.Runtime.Remoting.Messaging.IMethodCallMessage methodCallMessage) (at <eae584ce26bc40229c1b1aa476bfa589>:0)
System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize (System.IO.Stream serializationStream, System.Runtime.Remoting.Messaging.HeaderHandler handler, System.Boolean fCheck, System.Boolean isCrossAppDomain, System.Runtime.Remoting.Messaging.IMethodCallMessage methodCallMessage) (at <eae584ce26bc40229c1b1aa476bfa589>:0)
System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize (System.IO.Stream serializationStream, System.Runtime.Remoting.Messaging.HeaderHandler handler, System.Boolean fCheck, System.Runtime.Remoting.Messaging.IMethodCallMessage methodCallMessage) (at <eae584ce26bc40229c1b1aa476bfa589>:0)
System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize (System.IO.Stream serializationStream, System.Runtime.Remoting.Messaging.HeaderHandler handler, System.Boolean fCheck) (at <eae584ce26bc40229c1b1aa476bfa589>:0)
System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize (System.IO.Stream serializationStream, System.Runtime.Remoting.Messaging.HeaderHandler handler) (at <eae584ce26bc40229c1b1aa476bfa589>:0)
System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize (System.IO.Stream serializationStream) (at <eae584ce26bc40229c1b1aa476bfa589>:0)
Python.Runtime.RuntimeData.RestoreRuntimeDataImpl () (at <4d967fa352254671bac5c8512970d45e>:0)
Python.Runtime.RuntimeData.RestoreRuntimeData () (at <4d967fa352254671bac5c8512970d45e>:0)
Python.Runtime.Runtime.Initialize (System.Boolean initSigs) (at <4d967fa352254671bac5c8512970d45e>:0)
Python.Runtime.PythonEngine.Initialize (System.Collections.Generic.IEnumerable`1[T] args, System.Boolean setSysArgv, System.Boolean initSigs) (at <4d967fa352254671bac5c8512970d45e>:0)
Python.Runtime.PythonEngine.Initialize (System.Boolean setSysArgv, System.Boolean initSigs) (at <4d967fa352254671bac5c8512970d45e>:0)
Python.Runtime.PythonEngine.Initialize () (at <4d967fa352254671bac5c8512970d45e>:0)
UnityEditor.Scripting.Python.PythonRunner.DoEnsureInitialized () (at Packages/com.unity.scripting.python/Editor/PythonRunner.cs:677)
UnityEditor.Scripting.Python.PythonRunner.EnsureInitialized () (at Packages/com.unity.scripting.python/Editor/PythonRunner.cs:312)
UnityEditor.Scripting.Python.PythonRunner.RunFile (System.String pythonFileToExecute, System.String scopeName) (at Packages/com.unity.scripting.python/Editor/PythonRunner.cs:175)
UnityEditor.Scripting.Python.PythonScriptsWindow.ExecutePythonScript () (at Packages/com.unity.scripting.python/Editor/PythonScriptsWindow.cs:129)
UnityEngine.UIElements.Clickable.Invoke (UnityEngine.UIElements.EventBase evt) (at d:/unityengine/Modules/UIElements/Clickable.cs:81)
UnityEngine.UIElements.Clickable.OnMouseUp (UnityEngine.UIElements.MouseUpEvent evt) (at d:/unityengine/Modules/UIElements/Clickable.cs:158)
UnityEngine.UIElements.EventCallbackFunctor`1[TEventType].Invoke (UnityEngine.UIElements.EventBase evt) (at d:/unityengine/Modules/UIElements/Events/EventCallback.cs:64)
UnityEngine.UIElements.EventCallbackRegistry.InvokeCallbacks (UnityEngine.UIElements.EventBase evt) (at d:/unityengine/Modules/UIElements/Events/EventCallbackRegistry.cs:332)
UnityEngine.UIElements.CallbackEventHandler.HandleEvent (UnityEngine.UIElements.EventBase evt) (at d:/unityengine/Modules/UIElements/Events/EventHandler.cs:95)
UnityEngine.UIElements.CallbackEventHandler.HandleEventAtTargetPhase (UnityEngine.UIElements.EventBase evt) (at d:/unityengine/Modules/UIElements/Events/EventHandler.cs:77)
UnityEngine.UIElements.MouseCaptureDispatchingStrategy.DispatchEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at d:/unityengine/Modules/UIElements/Events/MouseCaptureDispatchingStrategy.cs:92)
UnityEngine.UIElements.EventDispatcher.ApplyDispatchingStrategies (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, System.Boolean imguiEventIsInitiallyUsed) (at d:/unityengine/Modules/UIElements/EventDispatcher.cs:310)
UnityEngine.UIElements.EventDispatcher.ProcessEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at d:/unityengine/Modules/UIElements/EventDispatcher.cs:275)
UnityEngine.UIElements.EventDispatcher.ProcessEventQueue () (at d:/unityengine/Modules/UIElements/EventDispatcher.cs:238)
UnityEngine.UIElements.EventDispatcher.OpenGate () (at d:/unityengine/Modules/UIElements/EventDispatcher.cs:203)
UnityEngine.UIElements.EventDispatcherGate.Dispose () (at d:/unityengine/Modules/UIElements/EventDispatcher.cs:44)
UnityEngine.UIElements.EventDispatcher.ProcessEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at d:/unityengine/Modules/UIElements/EventDispatcher.cs:301)
UnityEngine.UIElements.EventDispatcher.Dispatch (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, UnityEngine.UIElements.DispatchMode dispatchMode) (at d:/unityengine/Modules/UIElements/EventDispatcher.cs:159)
UnityEngine.UIElements.BaseVisualElementPanel.SendEvent (UnityEngine.UIElements.EventBase e, UnityEngine.UIElements.DispatchMode dispatchMode) (at d:/unityengine/Modules/UIElements/Panel.cs:257)
UnityEngine.UIElements.UIElementsUtility.DoDispatch (UnityEngine.UIElements.BaseVisualElementPanel panel) (at d:/unityengine/Modules/UIElements/UIElementsUtility.bindings.cs:404)
UnityEngine.UIElements.UIElementsUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at d:/unityengine/Modules/UIElements/UIElementsUtility.bindings.cs:194)
UnityEngine.GUIUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Int32& ret) (at d:/unityengine/Modules/IMGUI/GUIUtility.cs:198)

But Runtime._isInitialized has already been set to true and wasn’t cleared:

pythonnet/src/runtime/Runtime.cs

Line 113 in a21c797

_isInitialized = true;

After the above exception occurs, if you try to re-initialize the Python Engine, another exception will be encountered:

InvalidOperationException: This property must be set before runtime is initialized
Python.Runtime.Runtime.set_PythonDLL (System.String value) (at <4d967fa352254671bac5c8512970d45e>:0)
UnityEditor.Scripting.Python.PythonRunner.InstallAndLoadPython () (at Packages/com.unity.scripting.python/Editor/PythonRunner.cs:419)
UnityEditor.Scripting.Python.PythonRunner.DoEnsureInitialized () (at Packages/com.unity.scripting.python/Editor/PythonRunner.cs:674)
UnityEditor.Scripting.Python.PythonRunner.EnsureInitialized () (at Packages/com.unity.scripting.python/Editor/PythonRunner.cs:312)
UnityEditor.Scripting.Python.PythonRunner.RunFile (System.String pythonFileToExecute, System.String scopeName) (at Packages/com.unity.scripting.python/Editor/PythonRunner.cs:175)
UnityEditor.Scripting.Python.PythonScriptsWindow.ExecutePythonScript () (at Packages/com.unity.scripting.python/Editor/PythonScriptsWindow.cs:129)
UnityEngine.UIElements.Clickable.Invoke (UnityEngine.UIElements.EventBase evt) (at d:/unityengine/Modules/UIElements/Clickable.cs:81)
UnityEngine.UIElements.Clickable.OnMouseUp (UnityEngine.UIElements.MouseUpEvent evt) (at d:/unityengine/Modules/UIElements/Clickable.cs:158)
UnityEngine.UIElements.EventCallbackFunctor`1[TEventType].Invoke (UnityEngine.UIElements.EventBase evt) (at d:/unityengine/Modules/UIElements/Events/EventCallback.cs:64)
UnityEngine.UIElements.EventCallbackRegistry.InvokeCallbacks (UnityEngine.UIElements.EventBase evt) (at d:/unityengine/Modules/UIElements/Events/EventCallbackRegistry.cs:332)
UnityEngine.UIElements.CallbackEventHandler.HandleEvent (UnityEngine.UIElements.EventBase evt) (at d:/unityengine/Modules/UIElements/Events/EventHandler.cs:95)
UnityEngine.UIElements.CallbackEventHandler.HandleEventAtTargetPhase (UnityEngine.UIElements.EventBase evt) (at d:/unityengine/Modules/UIElements/Events/EventHandler.cs:77)
UnityEngine.UIElements.MouseCaptureDispatchingStrategy.DispatchEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at d:/unityengine/Modules/UIElements/Events/MouseCaptureDispatchingStrategy.cs:92)
UnityEngine.UIElements.EventDispatcher.ApplyDispatchingStrategies (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, System.Boolean imguiEventIsInitiallyUsed) (at d:/unityengine/Modules/UIElements/EventDispatcher.cs:310)
UnityEngine.UIElements.EventDispatcher.ProcessEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at d:/unityengine/Modules/UIElements/EventDispatcher.cs:275)
UnityEngine.UIElements.EventDispatcher.ProcessEventQueue () (at d:/unityengine/Modules/UIElements/EventDispatcher.cs:238)
UnityEngine.UIElements.EventDispatcher.OpenGate () (at d:/unityengine/Modules/UIElements/EventDispatcher.cs:203)
UnityEngine.UIElements.EventDispatcherGate.Dispose () (at d:/unityengine/Modules/UIElements/EventDispatcher.cs:44)
UnityEngine.UIElements.EventDispatcher.ProcessEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at d:/unityengine/Modules/UIElements/EventDispatcher.cs:301)
UnityEngine.UIElements.EventDispatcher.Dispatch (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, UnityEngine.UIElements.DispatchMode dispatchMode) (at d:/unityengine/Modules/UIElements/EventDispatcher.cs:159)
UnityEngine.UIElements.BaseVisualElementPanel.SendEvent (UnityEngine.UIElements.EventBase e, UnityEngine.UIElements.DispatchMode dispatchMode) (at d:/unityengine/Modules/UIElements/Panel.cs:257)
UnityEngine.UIElements.UIElementsUtility.DoDispatch (UnityEngine.UIElements.BaseVisualElementPanel panel) (at d:/unityengine/Modules/UIElements/UIElementsUtility.bindings.cs:404)
UnityEngine.UIElements.UIElementsUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at d:/unityengine/Modules/UIElements/UIElementsUtility.bindings.cs:194)
UnityEngine.GUIUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Int32& ret) (at d:/unityengine/Modules/IMGUI/GUIUtility.cs:198)

At this point, it is impossible to clean up the Python environment through PythonEngine.Shutdown, and the entire .NET environment can only be restarted.

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