Mutable Trying to Access Invalid UEdGraph Pointer

Hello,

We've started seeing a crash within Mutable when it tries to access the source graph in PIE. This only seems to be a problem when running a dedicated server as a separate process. We integrated CL39939289 to resolve the initial crash, but a second one has appeared in FCustomizableObjectEditorModule::GetReferenceSkeletalMesh.

It seems to be crashing trying to read the information from the RootObject as it is first in the list. Looking at other entries at random, they seemed to have a valid pointer. Not sure what happened there, but seeing as CL39939289 was a speculative fix, perhaps this information will help you repro it.

> UnrealEditor-CustomizableObjectEditor.dll!FCustomizableObjectEditorModule::GetReferenceSkeletalMesh(const UCustomizableObject & Object, const FName & ComponentName) Line 718 C++
UnrealEditor-CustomizableObject.dll!UCustomizableObject::GetComponentMeshReferenceSkeletalMesh(const FName & ComponentName) Line 1305 C++
UnrealEditor-CustomizableObject.dll!UCustomizableObjectInstanceUsagePrivate::Tick(float DeltaTime) Line 652 C++
UnrealEditor-Engine.dll!FTickableGameObject::TickObjects(UWorld * World, ELevelTick LevelTickType, bool bIsPaused, float DeltaSeconds) Line 196 C++
UnrealEditor-Engine.dll!UGameEngine::Tick(float DeltaSeconds, bool bIdleMode) Line 1852 C++
UnrealEditor-Win64-DebugGame.exe!FEngineLoop::Tick() Line 5931 C++
[Inline Frame] UnrealEditor-Win64-DebugGame.exe!EngineTick() Line 69 C++
UnrealEditor-Win64-DebugGame.exe!GuardedMain(const wchar_t * CmdLine) Line 188 C++
UnrealEditor-Win64-DebugGame.exe!LaunchWindowsStartup(HINSTANCE__ * hInInstance, HINSTANCE__ * hPrevInstance, char * __formal, int nCmdShow, const wchar_t * CmdLine) Line 266 C++
UnrealEditor-Win64-DebugGame.exe!WinMain(HINSTANCE__ * hInInstance, HINSTANCE__ * hPrevInstance, char * pCmdLine, int nCmdShow) Line 323 C++
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