This is a trending crash coming out of the 4.18 release, and may be a regression. Users have not provided any descriptions of their actions when the crash occurred.
Source Context
347 static TSharedPtr< FWindowsWindow > FindWindowByHWND(const TArray< TSharedRef< FWindowsWindow > >& WindowsToSearch, HWND HandleToFind) 348 { 349 for (int32 WindowIndex = 0; WindowIndex < WindowsToSearch.Num(); ++WindowIndex) 350 { 351 TSharedRef< FWindowsWindow > Window = WindowsToSearch[WindowIndex]; 352 if (Window->GetHWnd() == HandleToFind) 353 { 354 return Window; 355 } 356 ***** } 357 358 return TSharedPtr< FWindowsWindow >(nullptr); 359 }
repro steps currently unknown
Access violation - code c0000005 (first/second chance not available) UE4Editor_ApplicationCore!FindWindowByHWND() [windowsapplication.cpp:357] UE4Editor_ApplicationCore!FWindowsApplication::ProcessMessage() [windowsapplication.cpp:729] UE4Editor_ApplicationCore!FWindowsApplication::AppWndProc() [windowsapplication.cpp:725] user32!UserCallWinProcCheckWow() user32!DispatchMessageWorker() UE4Editor_ApplicationCore!FWindowsPlatformApplicationMisc::PumpMessages() [windowsplatformapplicationmisc.cpp:129] UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:3220] 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()
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-51929 in the post.