This is a common engine crash that has occurred since at least 4.16. Users have not provided any useful descriptions of their actions when the crash occurred.

The callstack shares some similarities to UE-48429. The callstack is also frequently seen in an Ensure that shares the same crashGroup, and the error message of that Ensure references Object->IsValidLowLevelFast, which again is similar to UE-48429.

Source Context

 3318       protected:
 3319       	virtual FArchive& operator<<(UObject*& Object) override
 3320       	{
 3321       #if !(UE_BUILD_TEST || UE_BUILD_SHIPPING)
 3322       		if (!ensureMsgf((Object == nullptr) || Object->IsValidLowLevelFast()
 3323       			, TEXT("Invalid object referenced by the PersistentFrame: 0x%016llx (Blueprint object: %s, ReferencingProperty: %s) - If you have a reliable repro for this, please contact the development team with it.")
 3324       			, (int64)(PTRINT)Object
 3325       			, SerializingObject ? *SerializingObject->GetFullName() : TEXT("NULL")
 3326       			, GetSerializedProperty() ? *GetSerializedProperty()->GetFullName() : TEXT("NULL")))
 3327       		{
 3328       			// clear the property value (it's garbage)... the ubergraph-frame
 3329       			// has just lost a reference to whatever it was attempting to hold onto
 3330 ***** 			Object = nullptr;
 3331       		}
Steps to Reproduce

repro steps currently unknown

Access violation - code c0000005 (first/second chance not available)

UE4Editor_CoreUObject!FPersistentFrameCollectorArchive::operator<<() uobjectglobals.cpp:3331 
UE4Editor_CoreUObject!UStruct::SerializeBin() class.cpp:837 
UE4Editor_Engine!UBlueprintGeneratedClass::AddReferencedObjectsInUbergraphFrame() blueprintgeneratedclass.cpp:1428 
UE4Editor_CoreUObject!TFastReferenceCollector<1,FGCReferenceProcessor<1>,FGCCollector<1>,FGCArrayPool,0>::ProcessObjectArray() fastreferencecollector.h:775 
UE4Editor_CoreUObject!TFastReferenceCollector<1,FGCReferenceProcessor<1>,FGCCollector<1>,FGCArrayPool,0>::FCollectorTaskQueue::DoTask() fastreferencecollector.h:381 
UE4Editor_CoreUObject!TGraphTask<TFastReferenceCollector<1,FGCReferenceProcessor<1>,FGCCollector<1>,FGCArrayPool,0>::FCollectorTaskProcessorTask>::Exe taskgraphinterfaces.h:784 
UE4Editor_Core!FTaskThreadAnyThread::ProcessTasks() taskgraph.cpp:910 
UE4Editor_Core!FTaskThreadAnyThread::ProcessTasksUntilQuit() taskgraph.cpp:786 
UE4Editor_Core!FTaskThreadBase::Run() taskgraph.cpp:502 
UE4Editor_Core!FRunnableThreadWin::Run() windowsrunnablethread.cpp:76 

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ComponentGameplay - Blueprint
Affects Versions4.
CreatedNov 2, 2017
ResolvedApr 20, 2018
UpdatedJun 25, 2019