This is a somewhat common crash that has occurred throughout the 4.17 release. Users have not provided any description of their actions when the crash occurred.
The callstack is similar to some old crashes fixed back in 4.10 ([Link Removed], [Link Removed]) although this one doesn't share the lines related to HotReload.
Source Context
1870 // WARNING: for (TPair<UClass*, UClass*> OldToNewClass : InOldToNewClassMap) duplicated below 1871 // to handle reconstructing actors which need to be reinstanced aftertheir owned components 1872 // have been updated: 1873 for (TPair<UClass*, UClass*> OldToNewClass : InOldToNewClassMap) 1874 { 1875 UClass* OldClass = OldToNewClass.Key; 1876 UClass* NewClass = OldToNewClass.Value; 1877 check(OldClass && NewClass); 1878 #if WITH_HOT_RELOAD 1879 ***** check(OldClass != NewClass || GIsHotReload); 1880 #else 1881 check(OldClass != NewClass); 1882 #endif
1. select 'Reload' from the Asset Actions menu of the BP_ParentClassISMissingType.uasset in QAGame
Assertion failed: OldClass && NewClass [File:D:\Build\++UE4+Release-4.17+Compile\Sync\Engine\Source\Editor\UnrealEd\Private\Kismet2\KismetReinstanceUtilities.cpp] [Line: 1878] UE4Editor_UnrealEd!FBlueprintCompileReinstancer::ReplaceInstancesOfClass_Inner() [kismetreinstanceutilities.cpp:1880] UE4Editor_UnrealEd!FBlueprintCompileReinstancer::ReplaceInstancesOfClass() [kismetreinstanceutilities.cpp:1463] UE4Editor_UnrealEd!UEditorEngine::HandlePackageReloaded() [editorengine.cpp:694] UE4Editor_UnrealEd!TBaseUObjectMethodDelegateInstance<0,UEditorEngine,void __cdecl() [delegateinstancesimpl.h:858] UE4Editor_CoreUObject!TBaseMulticastDelegate<void,enum EPackageReloadPhase,FPackageReloadedEvent * __ptr64>::Broadcast() [delegatesignatureimpl.inl:937] UE4Editor_CoreUObject!ReloadPackages() [packagereload.cpp:481] UE4Editor_UnrealEd!PackageTools::ReloadPackages() [packagetools.cpp:584] UE4Editor_UnrealEd!PackageTools::ReloadPackages() [packagetools.cpp:424] UE4Editor_ContentBrowser!FAssetContextMenu::ExecuteReload() [assetcontextmenu.cpp:1904] UE4Editor_ContentBrowser!TBaseSPMethodDelegateInstance<0,FAssetContextMenu,0,TTypeWrapper<void> __cdecl() [delegateinstancesimpl.h:327] UE4Editor_ContentBrowser!TBaseSPMethodDelegateInstance<0,FAssetContextMenu,0,void __cdecl() [delegateinstancesimpl.h:434] UE4Editor_Slate!SMenuEntryBlock::OnClicked() [smenuentryblock.cpp:1051] UE4Editor_Slate!SMenuEntryBlock::OnMenuItemButtonClicked() [smenuentryblock.cpp:1002] UE4Editor_Slate!TMemberFunctionCaller<SMenuEntryBlock,FReply() [delegateinstanceinterface.h:165] UE4Editor_Slate!UE4Tuple_Private::TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter<TMemberFunctionCaller<SMenuEntryBlock,FReply() [tuple.h:497] UE4Editor_Slate!TBaseSPMethodDelegateInstance<0,SMenuEntryBlock,0,FReply __cdecl() [delegateinstancesimpl.h:327] UE4Editor_Slate!TBaseDelegate<FReply>::Execute() [delegatesignatureimpl.inl:537] UE4Editor_Slate!SButton::OnMouseButtonUp() [sbutton.cpp:282] UE4Editor_Slate!SMenuEntryButton::OnMouseButtonUp() [smenuentryblock.cpp:399] UE4Editor_Slate!<lambda_1002768c627006711ef2f351a87ec0e7>::operator() [slateapplication.cpp:5199] UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_1002768c627006711ef2f351a87ec0e7> >() [slateapplication.cpp:232] UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() [slateapplication.cpp:5188] UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() [slateapplication.cpp:5690] UE4Editor_Slate!FSlateApplication::OnMouseUp() [slateapplication.cpp:5670] UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() [windowsapplication.cpp:1718] UE4Editor_Core!FWindowsApplication::DeferMessage() [windowsapplication.cpp:2161] UE4Editor_Core!FWindowsApplication::ProcessMessage() [windowsapplication.cpp:881] UE4Editor_Core!FWindowsApplication::AppWndProc() [windowsapplication.cpp:721] user32!UserCallWinProcCheckWow() user32!DispatchMessageWorker() UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() [windowsplatformmisc.cpp:1009] UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:3151] 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()
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-50834 in the post.
| 0 |
| Component | UE - Gameplay - Blueprint Compiler |
|---|---|
| Affects Versions | 4.17, 4.18 |
| Target Fix | 4.19 |
| Created | Oct 5, 2017 |
|---|---|
| Resolved | Dec 13, 2017 |
| Updated | Apr 27, 2018 |