Pig of a crash - "Pure virtual function being called while application was running"

Development Programming & Scripting C++
5

And the second - same of the first, occurred when I pressed ESCAPE to end PIE
Fatal error: [File:D:/Build/++UE4/Sync/Engine/Source/Runtime/Core/Private/Windows/WindowsPlatformMisc.cpp] [Line: 475] Pure virtual function being called

UE4Editor_Core
VCRUNTIME140
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_Core
UE4Editor_Core
UE4Editor_Core
UE4Editor_Core
UE4Editor_Core
kernel32
ntdll