This is a trending crash coming out of the 4.18 previews and 4.18.0.
The callstack is similar to a Mac crash that was fixed in 4.16.2 - [Link Removed]
User Descriptions
Source Context
1316 /** @return true if the window is visible, false otherwise*/ 1317 bool SWindow::IsVisible() const 1318 { 1319 ***** return NativeWindow.IsValid() && NativeWindow->IsVisible(); 1320 } 1321 1322 bool SWindow::IsWindowMaximized() const 1323 { 1324 if ( NativeWindow.IsValid() ) 1325 { 1326 return NativeWindow->IsMaximized(); 1327 } 1328 1329 return false; 1330 }
repro steps currently unknown
Access violation - code c0000005 (first/second chance not available) UE4Editor_SlateCore!SWindow::IsVisible() [swindow.cpp:1320] UE4Editor_Slate!PrepassWindowAndChildren() [slateapplication.cpp:1336] UE4Editor_Slate!FSlateApplication::DrawPrepass() [slateapplication.cpp:1391] UE4Editor_Slate!FSlateApplication::PrivateDrawWindows() [slateapplication.cpp:1433] UE4Editor_Slate!FSlateApplication::DrawWindows() [slateapplication.cpp:1190] UE4Editor_Slate!FSlateApplication::TickApplication() [slateapplication.cpp:1777] UE4Editor_Slate!FSlateApplication::Tick() [slateapplication.cpp:1595] UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:3378] 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-51146 in the post.