Problem
I am getting an error and crash in plugins that open a web view when the mouse enters the view. I noticed this in both Quixel Bridge and the MetaHuman Plugin. So far, I’ve gotten the crash on 5.0.3, 5.2, 5.3, and a locally compiled instance of 5.3. I’ve uninstalled and reinstalled the Epic Launcher and Editors multiple times. There is a workaround listed below.
Plugins Installed
Web Browser
Web Authentication Plugin
MetaHuman Plugin
Bridge
Steps
- Create a new project.
- Open the Quixel View in the Unreal Editor
- Click to Sign In the upper right of the Quixel Bridge view
- Move mouse into the Login view
- Crash
Note: The Quixel Bridge view also crashes at times with the same error. Additionally, the MetaHuman Login view crashes at the same line for similar reasons.
Workaround
Close the Widget Reflector Tab and the crash no longer occurs
Result
Assertion failed: Index>=0 && Index<NumBits [File:D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Containers\BitArray.h] [Line: 1418]
UnrealEditor_SlateReflector!TBaseRawMethodDelegateInstance<1,SWidgetEventLog const ,void __cdecl(FSlateDebuggingCursorQueryEventArgs const &),FDefaultDelegateUserPolicy>::ExecuteIfSafe() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:535]
UnrealEditor_SlateCore!FSlateDebugging::BroadcastCursorQuery() [D:\build\++UE5\Sync\Engine\Source\Runtime\SlateCore\Private\Debugging\SlateDebugging.cpp:648]
UnrealEditor_Slate!FSlateUser::QueryCursor() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateUser.cpp:807]
UnrealEditor_Slate!FSlateApplication::QueryCursor() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:3552]
UnrealEditor_WebBrowser!FCEFBrowserHandler::OnCursorChange() [D:\build\++UE5\Sync\Engine\Source\Runtime\WebBrowser\Private\CEF\CEFBrowserHandler.cpp:358]
UnrealEditor_WebBrowser!CefCppToCRefCounted<CefDisplayHandlerCppToC,CefDisplayHandler,_cef_display_handler_t>::UnwrapDerived()
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UnrealEditor_WebBrowser!FWebBrowserSingleton::Tick() [D:\build\++UE5\Sync\Engine\Source\Runtime\WebBrowser\Private\WebBrowserSingleton.cpp:778]
UnrealEditor_Core!TBaseRawMethodDelegateInstance<0,FTSTickerObjectBase,bool __cdecl(float),FDefaultDelegateUserPolicy>::Execute() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:518]
UnrealEditor_Core!FTSTicker::FElement::Fire() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\Containers\Ticker.cpp:157]
UnrealEditor_Core!FTSTicker::Tick() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\Containers\Ticker.cpp:110]
UnrealEditor!FEngineLoop::Tick() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:6073]
UnrealEditor!GuardedMain() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Launch.cpp:188]
UnrealEditor!GuardedMainWrapper() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:118]
UnrealEditor!LaunchWindowsStartup() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:258]
UnrealEditor!WinMain() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:298]
UnrealEditor!__scrt_common_main_seh() [D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
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Specs
| Field | Value |
|---|---|
| Edition | Windows 11 Pro |
| Version | 22H2 |
| Installed on | 12/14/2022 |
| OS build | 22621.2283 |
| Experience | Windows Feature Experience Pack 1000.22662.1000.0 |
| Processor | AMD Ryzen 9 7900X 12-Core Processor 4.70 GHz |
| Installed RAM | 64.0 GB (63.1 GB usable) |
| Pen and touch | Pen and touch support with 2 touch points |