InvalidOperationException when running in the Editor

[Rami]

In 2018.3.0f2 when I start the game in the Editor, I am usually met with this exception

InvalidOperationException: EnsureRunningOnMainThread can only be called from the main thread
UnityEngine.Object.EnsureRunningOnMainThread () (at C:/buildslave/unity/build/Runtime/Export/UnityEngineObject.bindings.cs:153)
UnityEngine.Object.GetInstanceID () (at C:/buildslave/unity/build/Runtime/Export/UnityEngineObject.bindings.cs:73)
UnityEngine.Object.IsNativeObjectAlive (UnityEngine.Object o) (at C:/buildslave/unity/build/Runtime/Export/UnityEngineObject.bindings.cs:182)
UnityEngine.Object.CompareBaseObjects (UnityEngine.Object lhs, UnityEngine.Object rhs) (at C:/buildslave/unity/build/Runtime/Export/UnityEngineObject.bindings.cs:140)
UnityEngine.Object.op_Equality (UnityEngine.Object x, UnityEngine.Object y) (at C:/buildslave/unity/build/Runtime/Export/UnityEngineObject.bindings.cs:403)
ParadoxNotion.Serialization.fsUnityObjectConverter.TryDeserialize (ParadoxNotion.Serialization.FullSerializer.fsData data, System.Object& instance, System.Type storageType) (at Assets/Plugins/ParadoxNotion/CanvasCore/Common/Runtime/Serialization/fsUnityObjectConverter.cs:70)
ParadoxNotion.Serialization.FullSerializer.fsSerializer.InternalDeserialize_5_Converter (System.Type overrideConverterType, ParadoxNotion.Serialization.FullSerializer.fsData data, System.Type resultType, System.Object& result) (at Assets/Plugins/ParadoxNotion/CanvasCore/Common/Runtime/Serialization/Full Serializer/fsSerializer.cs:886)
ParadoxNotion.Serialization.FullSerializer.fsSerializer.InternalDeserialize_4_Cycles (System.Type overrideConverterType, ParadoxNotion.Serialization.FullSerializer.fsData data, System.Type resultType, System.Object& result) (at Assets/Plugins/ParadoxNotion/CanvasCore/Common/Runtime/Serialization/Full Serializer/fsSerializer.cs:878)
ParadoxNotion.Serialization.FullSerializer.fsSerializer.InternalDeserialize_3_Inheritance (System.Type overrideConverterType, ParadoxNotion.Serialization.FullSerializer.fsData data, System.Type storageType, System.Object& result, System.Collections.Generic.List
1[ParadoxNotion.Serialization.FullSerializer.fsObjectProcessor]& processors) (at Assets/Plugins/ParadoxNotion/CanvasCore/Common/Runtime/Serialization/Full Serializer/fsSerializer.cs:857)
ParadoxNotion.Serialization.FullSerializer.fsSerializer.InternalDeserialize_1_CycleReference (System.Type overrideConverterType, ParadoxNotion.Serialization.FullSerializer.fsData data, System.Type storageType, System.Object& result, System.Collections.Generic.List1[ParadoxNotion.Serialization.FullSerializer.fsObjectProcessor]& processors) (at Assets/Plugins/ParadoxNotion/CanvasCore/Common/Runtime/Serialization/Full Serializer/fsSerializer.cs:743)
ParadoxNotion.Serialization.FullSerializer.fsSerializer.TryDeserialize (ParadoxNotion.Serialization.FullSerializer.fsData data, System.Type storageType, System.Type overrideConverterType, System.Object& result) (at Assets/Plugins/ParadoxNotion/CanvasCore/Common/Runtime/Serialization/Full Serializer/fsSerializer.cs:705)
UnityEngine.Logger:LogException(Exception)
ParadoxNotion.Services.Logger:ForwardToUnity(LogType, Object, String, Object) (at Assets/Plugins/ParadoxNotion/CanvasCore/Common/Runtime/Services/Logger.cs:100)
ParadoxNotion.Services.<>c__DisplayClass11_0:<Internal_Log>b__0() (at Assets/Plugins/ParadoxNotion/CanvasCore/Common/Runtime/Services/Logger.cs:88)
UnityEditor.EditorApplication:Internal_CallDelayFunctions()

[Gavalakis]

Hello again and sorry for the late reply due to xmas vacation.

Thanks for letting me know. I am using 2018.3.0f2, but have never seen this exception shown. I will need to dig a bit deeper to find what might be causing this based on the log you’ve posted.

Thanks.

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