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.
Nearly all affected project names reference that this occurs on VR projects
Source Context
1522 /**
1523 * Empties the array. It calls the destructors on held items if needed.
1524 *
1525 * @param Slack (Optional) The expected usage size after empty operation. Default is 0.
1526 */
1527 void Empty(int32 Slack = 0)
1528 {
1529 ***** DestructItems(GetData(), ArrayNum);
1530
1531 checkSlow(Slack >= 0);
1532 ArrayNum = 0;
1533
1534 if (ArrayMax != Slack)
1535 {
1536 ResizeTo(Slack);
1537 }
1538 }
repro steps currently unknown
Access violation - code c0000005 (first/second chance not available) UE4Editor_SlateCore!TArray<FHittestGrid::FCachedWidget,FDefaultAllocator>::Empty() [array.h:1530] UE4Editor_SlateCore!TArray<FHittestGrid::FCachedWidget,FDefaultAllocator>::Reset() [array.h:1521] UE4Editor_SlateCore!FHittestGrid::ClearGridForNewFrame() [hittestgrid.cpp:255] UE4Editor_Slate!FSlateApplication::DrawWindowAndChildren() [slateapplication.cpp:1229] UE4Editor_Slate!FSlateApplication::PrivateDrawWindows() [slateapplication.cpp:1473] 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-52248 in the post.