Description

This is a somewhat common crash coming out of the 4.17 release.

User Descriptions

  • clicked Launch->Firefox. This is the same project with in-game video-screens which has been crashing on Launch for Windows x64 and Package Project for Windows x64.

Source Context

 4579       				for (int32 i = 0; i < Linker->ExportMap.Num(); i++)
 4580       				{
 4581       					FObjectExport& Export = Linker->ExportMap[i];
 4582       					if (Export.Object)
 4583       					{
 4584       						// Set class index.
 4585       						// If this is *exactly* a UClass, store null instead; for anything else, including UClass-derived classes, map it
 4586       						UClass* ObjClass = Export.Object->GetClass();
 4587       						if (ObjClass != UClass::StaticClass())
 4588       						{
 4589       							Export.ClassIndex = Linker->MapObject(ObjClass);
 4590       							check(!Export.ClassIndex.IsNull());
 4591       						}
 4592 ***** 						else
 4593       						{
 4594       							Export.ClassIndex = FPackageIndex();
 4595       						}
 4596       
 4597       						if (IsEventDrivenLoaderEnabledInCookedBuilds() && TargetPlatform)
 4598       						{
 4599       							UObject* Archetype = Export.Object->GetArchetype();
 4600       							check(Archetype);
 4601       							check(Archetype->IsA(Export.Object->HasAnyFlags(RF_ClassDefaultObject) ? ObjClass->GetSuperClass() : ObjClass));
 4602       							Export.TemplateIndex = Linker->MapObject(Archetype);
 4603       							UE_CLOG(Export.TemplateIndex.IsNull(), LogSavePackage, Fatal, TEXT("%s was an archetype of %s but returned a null index mapping the object."), *Archetype->GetFullName(), *Export.Object->GetFullName());
 4604       							check(!Export.TemplateIndex.IsNull());
 4605       						}
Steps to Reproduce

repro steps currently unknown

Callstack
Assertion failed: !Export.ClassIndex.IsNull() 
[File:D:\Build\++UE4+Release-4.17+Compile\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\SavePackage.cpp] [Line: 4591]

UE4Editor_CoreUObject!UPackage::Save() [savepackage.cpp:4593]
UE4Editor_UnrealEd!UEditorEngine::Save() [editorengine.cpp:4210]
UE4Editor_UnrealEd!UCookOnTheFlyServer::SaveCookedPackage() [cookontheflyserver.cpp:3238]
UE4Editor_UnrealEd!UCookOnTheFlyServer::SaveCookedPackages() [cookontheflyserver.cpp:2324]
UE4Editor_UnrealEd!UCookOnTheFlyServer::TickCookOnTheSide() [cookontheflyserver.cpp:1786]
UE4Editor_UnrealEd!UCookOnTheFlyServer::Tick() [cookontheflyserver.cpp:879]
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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Unresolved
ComponentCore - UObject
Affects Versions4.174.184.194.204.21
CreatedSep 20, 2017
UpdatedJan 25, 2019