Pasting a button element from one Widget Blueprint into a second Widget Blueprint that has had its root Canvas Panel deleted results in a crash. The crash only occurs when the Canvas Panel is deleted. It also did not occur when I tested it with a Progress Bar and a Text Box, so it may be behavior specific to the button widget.
Tested in //UE4/Release-4.25 @ CL 14469661 and this did NOT occur, so marking as a Regression
RESULT:
The engine crashes
EXPECTED:
The button is pasted into the second WBP
=== Critical error: === Fatal error! Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x0000000000000010 [Callstack] 0x00007ff880881911 UE4Editor-UMGEditor.dll!FWidgetBlueprintEditorUtils::PasteWidgetsInternal() [D:\Build\++UE4\Sync\Engine\Source\Editor\UMGEditor\Private\WidgetBlueprintEditorUtils.cpp:1337] [Callstack] 0x00007ff88088143e UE4Editor-UMGEditor.dll!FWidgetBlueprintEditorUtils::PasteWidgets() [D:\Build\++UE4\Sync\Engine\Source\Editor\UMGEditor\Private\WidgetBlueprintEditorUtils.cpp:1318] [Callstack] 0x00007ff880881026 UE4Editor-UMGEditor.dll!FWidgetBlueprintEditor::PasteWidgets() [D:\Build\++UE4\Sync\Engine\Source\Editor\UMGEditor\Private\WidgetBlueprintEditor.cpp:526] [Callstack] 0x00007ff8808384d6 UE4Editor-UMGEditor.dll!TBaseSPMethodDelegateInstance<0,FWidgetBlueprintEditor,0,void __cdecl(void),FDefaultDelegateUserPolicy>::ExecuteIfSafe() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:307] [Callstack] 0x00007ff8d20b33a9 UE4Editor-Slate.dll!FUICommandList::ConditionalProcessCommandBindings() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Commands\UICommandList.cpp:220] [Callstack] 0x00007ff8d20ec62a UE4Editor-Slate.dll!FUICommandList::ProcessCommandBindings() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Commands\UICommandList.cpp:164] [Callstack] 0x00007ff880798f94 UE4Editor-UMGEditor.dll!SDesignerView::OnKeyDown() [D:\Build\++UE4\Sync\Engine\Source\Editor\UMGEditor\Private\Designer\SDesignerView.cpp:2005] [Callstack] 0x00007ff8d20825b2 UE4Editor-Slate.dll!FEventRouter::Route<FReply,FEventRouter::FBubblePolicy,FKeyEvent,<lambda_f630e7f24dbef73857a69219e32f2d96> >() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:383] [Callstack] 0x00007ff8d20ee368 UE4Editor-Slate.dll!FSlateApplication::ProcessKeyDownEvent() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:4325] [Callstack] 0x00007ff8d20e2226 UE4Editor-Slate.dll!FSlateApplication::OnKeyDown() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:4222] [Callstack] 0x00007ff8e92db958 UE4Editor-ApplicationCore.dll!FWindowsApplication::ProcessDeferredMessage() [D:\Build\++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2013] [Callstack] 0x00007ff8e92c9197 UE4Editor-ApplicationCore.dll!FWindowsApplication::DeferMessage() [D:\Build\++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2642] [Callstack] 0x00007ff8e92de389 UE4Editor-ApplicationCore.dll!FWindowsApplication::ProcessMessage() [D:\Build\++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:1046] [Callstack] 0x00007ff8e92c4310 UE4Editor-ApplicationCore.dll!FWindowsApplication::AppWndProc() [D:\Build\++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:878] [Callstack] 0x00007ff9059f5c1d USER32.dll!UnknownFunction [] [Callstack] 0x00007ff9059f5612 USER32.dll!UnknownFunction [] [Callstack] 0x00007ff8e92df914 UE4Editor-ApplicationCore.dll!FWindowsPlatformApplicationMisc::PumpMessages() [D:\Build\++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsPlatformApplicationMisc.cpp:130] [Callstack] 0x00007ff70f9e8848 UE4Editor.exe!FEngineLoop::Tick() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:4748] [Callstack] 0x00007ff70fa0117c UE4Editor.exe!GuardedMain() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Launch\Private\Launch.cpp:169] [Callstack] 0x00007ff70fa0125a UE4Editor.exe!GuardedMainWrapper() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:137] [Callstack] 0x00007ff70fa152bd UE4Editor.exe!WinMain() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:268] [Callstack] 0x00007ff70fa17fea UE4Editor.exe!__scrt_common_main_seh() [d:\agent\_work\5\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288] [Callstack] 0x00007ff9068f7c24 KERNEL32.DLL!UnknownFunction [] [Callstack] 0x00007ff90758d721 ntdll.dll!UnknownFunction []
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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-113374 in the post.
| 4 |
| Component | UE - Editor - UI Systems |
|---|---|
| Affects Versions | 4.26.2 |
| Target Fix | 4.27 |
| Created | Apr 13, 2021 |
|---|---|
| Resolved | Apr 29, 2021 |
| Updated | May 8, 2021 |
| 7948 - mrbindraw |