This is a trending crash coming out of the 4.18 release. Users have not provided any descriptions of their actions when the crash occurred.
Source Context
296 // make sure the brushes are rebuilt
297 for (FNewBrushBuilder& NewObject : NewBuilders)
298 {
299 NewObject.Builder->Build(NewObject.Brush->GetWorld(), NewObject.Brush);
300 }
301
302 GEditor->RebuildAlteredBSP();
303 }
304
305 ***** DetailLayout->ForceRefreshDetails();
306 }
repro steps currently unknown
Access violation - code c0000005 (first/second chance not available) UE4Editor_DetailCustomizations!FBrushDetails::OnClassPicked() [brushdetails.cpp:306] UE4Editor_DetailCustomizations!TBaseSPMethodDelegateInstance<0,FBrushDetails,0,TTypeWrapper<void> __cdecl() [delegateinstancesimpl.h:327] UE4Editor_DetailCustomizations!TBaseSPMethodDelegateInstance<0,FBrushDetails,0,void __cdecl() [delegateinstancesimpl.h:434] UE4Editor_ClassViewer!SClassViewer::OnClassViewerSelectionChanged() [sclassviewer.cpp:2457] UE4Editor_ClassViewer!SClassViewer::OnFocusReceived() [sclassviewer.cpp:3159] UE4Editor_Slate!FSlateApplication::SetUserFocus() [slateapplication.cpp:2832] UE4Editor_Slate!FSlateApplication::RoutePointerDownEvent() [slateapplication.cpp:5199] UE4Editor_Slate!FSlateApplication::ProcessMouseButtonDownEvent() [slateapplication.cpp:5113] UE4Editor_Slate!FSlateApplication::OnMouseDown() [slateapplication.cpp:5031] UE4Editor_ApplicationCore!FWindowsApplication::ProcessDeferredMessage() [windowsapplication.cpp:1733] UE4Editor_ApplicationCore!FWindowsApplication::DeferMessage() [windowsapplication.cpp:2171] UE4Editor_ApplicationCore!FWindowsApplication::ProcessMessage() [windowsapplication.cpp:888] 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()
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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-52278 in the post.