Description

This is a common and longstanding crash that has affected many users since at least 4.11.

Source context not available (error in user code?).

User Descriptions

  • I was duplicating a Set function in code.
  • Engine crashed whilst copy paste.
  • trying to make an online event and yeah no
  • in blueprint editing gravity scale
  • I keep pasting a "Set Material" node and it's crashing.
Steps to Reproduce

repro steps currently unknown

Callstack
Fatal error: [File:D:\Build\++UE4+Release-4.17+Compile\Sync\Engine\Source\Runtime\CoreUObject\Private\Templates\Casts.cpp] [Line: 10] 
Cast of nullptr to Object failed

UE4Editor_CoreUObject!CastLogError() [casts.cpp:11]
UE4Editor_Kismet!CastChecked<UObject,UObject>() [casts.h:211]
UE4Editor_Kismet!FTabPayload_UObject::CastChecked<UObject>() [workflowuobjectdocuments.h:35]
UE4Editor_Kismet!FDocumentTabFactoryForObjects<UTimelineTemplate>::IsPayloadSupported() [workflowuobjectdocuments.h:101]
UE4Editor_Kismet!FDocumentTracker::FindSupportingFactory() [workflowtabmanager.cpp:659]
UE4Editor_Kismet!FDocumentTracker::OpenNewTab() [workflowtabmanager.cpp:601]
UE4Editor_Kismet!FDocumentTracker::OpenDocument() [workflowtabmanager.cpp:529]
UE4Editor_Kismet!FBlueprintEditor::OpenDocument() [blueprinteditor.cpp:7890]
UE4Editor_Kismet!FBlueprintEditor::NavigateTab() [blueprinteditor.cpp:7895]
UE4Editor_Kismet!TBaseSPMethodDelegateInstance<0,FBlueprintEditor,0,TTypeWrapper<void> __cdecl() [delegateinstancesimpl.h:327]
UE4Editor_Kismet!TBaseSPMethodDelegateInstance<0,FBlueprintEditor,0,void __cdecl() [delegateinstancesimpl.h:434]
UE4Editor_GraphEditor!SGraphEditorImpl::OnMouseButtonDown() [sgrapheditorimpl.cpp:72]
UE4Editor_Slate!<lambda_7097b900f0e4be30d80fb18f98c51ea0>::operator() [slateapplication.cpp:5104]
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FBubblePolicy,FPointerEvent,<lambda_7097b900f0e4be30d80fb18f98c51ea0> >() [slateapplication.cpp:232]
UE4Editor_Slate!FSlateApplication::RoutePointerDownEvent() [slateapplication.cpp:5093]
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonDownEvent() [slateapplication.cpp:5050]
UE4Editor_Slate!FSlateApplication::OnMouseDown() [slateapplication.cpp:4968]
UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() [windowsapplication.cpp:1726]
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()

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Fixed
ComponentGameplay
Affects Versions4.114.124.134.144.154.164.17
Target Fix4.18
Fix Commit3686375
Release Commit3686419
CreatedOct 5, 2017
ResolvedOct 9, 2017
UpdatedApr 27, 2018