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 [Link Removed]. 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 [Link Removed].
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 }
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
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-51952 in the post.
| 10 |
| Component | UE - Gameplay - Blueprint |
|---|---|
| Affects Versions | 4.16, 4.17, 4.18, 4.19 |
| Created | Nov 2, 2017 |
|---|---|
| Resolved | Aug 18, 2021 |
| Updated | Aug 18, 2021 |