This is a longstanding crash that occurs with low frequency per release, but has affected 400 users since the 4.11 release. Unfortunately among all of them, only one has provided any description.
User Descriptions
Source Context
1792 private: 1793 1794 /** 1795 * Adds unique element to array if it doesn't exist. 1796 * 1797 * @param Args Item to add. 1798 * @returns Index of the element in the array. 1799 */ 1800 template <typename ArgsType> 1801 int32 AddUniqueImpl(ArgsType&& Args) 1802 { 1803 int32 Index; 1804 ***** if (Find(Args, Index)) 1805 { 1806 return Index; 1807 } 1808 1809 return Add(Forward<ArgsType>(Args)); 1810 }
repro steps currently unknown
Access violation - code c0000005 (first/second chance not available) UE4Editor_UnrealEd!TArray<TSharedRef<FAssetThumbnailPool::FThumbnailInfo,0>,FDefaultAllocator>::AddUniqueImpl<TSharedRef<FAssetThumbnailPool::FThumbnailInfo,0> const & __ptr64>() [array.h:1805] UE4Editor_UnrealEd!FAssetThumbnailPool::Tick() [assetthumbnail.cpp:1009] UE4Editor_UnrealEd!FTickableEditorObject::TickObjects() [tickableeditorobject.h:21] UE4Editor_UnrealEd!UEditorEngine::Tick() [editorengine.cpp:1424] UE4Editor_UnrealEd!UUnrealEdEngine::Tick() [unrealedengine.cpp:402] UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:3215] UE4Editor!GuardedMain() [launch.cpp:166] UE4Editor!GuardedMainWrapper() [launchwindows.cpp:134] UE4Editor!WinMain() [launchwindows.cpp:210] UE4Editor!__scrt_common_main_seh() [exe_common.inl:253] kernel32!BaseThreadInitThunk() ntdll!RtlUserThreadStart()
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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-50099 in the post.