Unreal Engine Issues and Bug Tracker (UE-96105)

Description

Crash occurs when the user changes a Text variable to a String while the Details panel is displaying its properties, and then compiling.

Crash does not seem to occur if the Details are not visible. Crash also does not seem to occur if the variable is changed to other types.

Steps to Reproduce

Open any project in editor.
Open the level blueprint.
Add a variable and change its type to Text.
Compile.
Select the variable, so its Details are visible.
While the Details are still visible, change the variable type to String.
Compile again.

RESULT

Crash

Callstack

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x1acf0000

VCRUNTIME140.dll!UnknownFunction []
UE4Editor-Core.dll!FGenericPlatformString::Memcpy() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Private\GenericPlatform\GenericPlatformString.cpp:21]
UE4Editor-Core.dll!FString::AppendChars() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Private\Containers\String.cpp:191]
UE4Editor-CoreUObject.dll!FProperty::ExportText_Direct() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\Property.cpp:840]
UE4Editor-PropertyEditor.dll!FPropertyHandleBase::GetPerObjectValue() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Editor\PropertyEditor\Private\PropertyHandleImpl.cpp:2784]
UE4Editor-DetailCustomizations.dll!`anonymous namespace'::FEditableTextPropertyHandle::GetText() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Editor\DetailCustomizations\Private\TextCustomization.cpp:62]
UE4Editor-EditorWidgets.dll!STextPropertyEditableTextBox::GetTextWarningImageVisibility() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Editor\EditorWidgets\Private\STextPropertyEditableTextBox.cpp:1435]
UE4Editor-EditorWidgets.dll!TBaseSPMethodDelegateInstance<1,STextPropertyEditableTextBox,0,EVisibility __cdecl(void)>::Execute() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:298]
UE4Editor-SlateCore.dll!ComputeDesiredSizeForBox<0>() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SBoxPanel.cpp:205]
UE4Editor-SlateCore.dll!SBoxPanel::ComputeDesiredSize() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SBoxPanel.cpp:256]
UE4Editor-SlateCore.dll!SWidget::CacheDesiredSize() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:831]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1476]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::Prepass_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1460]
UE4Editor-SlateCore.dll!SWidget::SlatePrepass() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:608]
UE4Editor-Slate.dll!PrepassWindowAndChildren() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:1102]
UE4Editor-Slate.dll!PrepassWindowAndChildren() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:1110]
UE4Editor-Slate.dll!FSlateApplication::DrawPrepass() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:1151]
UE4Editor-Slate.dll!FSlateApplication::PrivateDrawWindows() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:1198]
UE4Editor-Slate.dll!FSlateApplication::TickApplication() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:1496]
UE4Editor-Slate.dll!FSlateApplication::Tick() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:1358]
UE4Editor.exe!FEngineLoop::Tick() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:4940]
UE4Editor.exe!GuardedMain() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Launch\Private\Launch.cpp:169]
UE4Editor.exe!GuardedMainWrapper() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:137]
UE4Editor.exe!WinMain() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:268]
UE4Editor.exe!__scrt_common_main_seh() [d:\agent\_work\5\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
KERNEL32.DLL!UnknownFunction []
ntdll.dll!UnknownFunction []

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Fixed

Component	UE - Gameplay - Blueprint Editor
Affects Versions	4.25, 4.26
Target Fix	4.25.4

Fix Commit	14162849
Release Commit	14162849

Created	Jul 29, 2020
Resolved	Sep 10, 2020
Updated	Apr 28, 2021

Pull Requests

7675 - Edstub207

7540 - Edstub207

View Jira Issue

UE-96105

Crash compiling a blueprint after changing a Text variable to String, while the Details panel are visible

Crash compiling a blueprint after changing a Text variable to String, while the Details panel are visible

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