This is a common crash in the 4.16 and 4.17 releases.
User Descriptions
Source Context
278 // As DEFAULT_ALIGNMENT is defined to 0 now, I changed that to the original numerical value here 279 const int32 AlignmentCheck = MIN_ALIGNMENT - 1; 280 281 // Check 'this' pointer before trying to access any of the Object's members 282 if ((this == nullptr) || (UPTRINT)this < 0x100) 283 { 284 UE_LOG(LogUObjectBase, Error, TEXT("\'this\' pointer is invalid.")); 285 return false; 286 } 287 if ((UPTRINT)this & AlignmentCheck) 288 { 289 UE_LOG(LogUObjectBase, Error, TEXT("\'this\' pointer is misaligned.")); 290 return false; 291 } 292 ***** if (*(void**)this == nullptr) 293 { 294 UE_LOG(LogUObjectBase, Error, TEXT("Virtual functions table is invalid.")); 295 return false; 296 }
repro steps currently unknown
Access violation - code c0000005 (first/second chance not available) UE4Editor_CoreUObject!UObjectBase::IsValidLowLevelFast() [uobjectbase.cpp:294] UE4Editor_CoreUObject!TFastReferenceCollector<1,FGCReferenceProcessor<1>,FGCCollector<1>,FGCArrayPool,0>::ProcessObjectArray() [fastreferencecollector.h:614] UE4Editor_CoreUObject!TFastReferenceCollector<1,FGCReferenceProcessor<1>,FGCCollector<1>,FGCArrayPool,0>::FCollectorTaskQueue::DoTask() [fastreferencecollector.h:299] UE4Editor_CoreUObject!TGraphTask<TFastReferenceCollector<1,FGCReferenceProcessor<1>,FGCCollector<1>,FGCArrayPool,0>::FCollectorTaskProcessorTask>::ExecuteTask() [taskgraphinterfaces.h:784] UE4Editor_Core!FTaskThreadAnyThread::ProcessTasks() [taskgraph.cpp:907] UE4Editor_Core!FTaskThreadAnyThread::ProcessTasksUntilQuit() [taskgraph.cpp:785] UE4Editor_Core!FTaskThreadBase::Run() [taskgraph.cpp:501] UE4Editor_Core!FRunnableThreadWin::Run() [windowsrunnablethread.cpp:76]
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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-48712 in the post.