This happens when using build with revision 72fb72f097dc42594927ac615b2ea0099a0241f4
The crash reporter displays this:
Access violation - code c0000005 (first/second chance not available)
UE4Editor_Engine!ANavigationData::TickAsyncBuild() [c:\programs\ue4.7\engine\source\runtime\engine\private\ai\navigation\navigationdata.cpp:453]
UE4Editor_Engine!UNavigationSystem::Tick() [c:\programs\ue4.7\engine\source\runtime\engine\private\ai\navigation\navigationsystem.cpp:762]
UE4Editor_Engine!UWorld::Tick() [c:\programs\ue4.7\engine\source\runtime\engine\private\leveltick.cpp:1085]
UE4Editor_UnrealEd!UEditorEngine::Tick() [c:\programs\ue4.7\engine\source\editor\unrealed\private\editor.cpp:1345]
UE4Editor_UnrealEd!UUnrealEdEngine::Tick() [c:\programs\ue4.7\engine\source\editor\unrealed\private\unrealedengine.cpp:348]
UE4Editor!FEngineLoop::Tick() [c:\programs\ue4.7\engine\source\runtime\launch\private\launchengineloop.cpp:2315]
UE4Editor!GuardedMain() [c:\programs\ue4.7\engine\source\runtime\launch\private\launch.cpp:142]
UE4Editor!GuardedMainWrapper() [c:\programs\ue4.7\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() [c:\programs\ue4.7\engine\source\runtime\launch\private\windows\launchwindows.cpp:202]
The bug was introduced sometime after revision 9b09a7993221fbc669b31ffc7add5e8da5887134
