[CrashReport] UE4Editor-UnrealEd.dylib!FEditorModeTools::MouseMove()

GeneratedClass '/Game/Maps/World.World_C' with ClassGeneratedBy '/Game/Maps/World.World:PersistentLevel.World'
[1899.12.31-03.32.03:237][181]LogMac: === Critical error: ===
SIGSEGV: invalid attempt to access memory at address 0x30

[2017.11.20-11.34.51:237][181]LogMac: 0x0a2c7998 UE4Editor-UnrealEd.dylib!FEditorModeTools::MouseMove(FEditorViewportClient*, FViewport*, int, int)   [UnknownFile]) 
0x0a362340 UE4Editor-UnrealEd.dylib!FEditorViewportClient::MouseMove(FViewport*, int, int)   [UnknownFile]) 
0x0680033d UE4Editor-Engine.dylib!FSceneViewport::OnMouseMove(FGeometry const&, FPointerEvent const&)   [UnknownFile]) 
0x06800455 UE4Editor-Engine.dylib!non-virtual thunk to FSceneViewport::OnMouseMove(FGeometry const&, FPointerEvent const&)   [UnknownFile]) 
0x0499d80f UE4Editor-Slate.dylib!SViewport::OnMouseMove(FGeometry const&, FPointerEvent const&)   [UnknownFile]) 
0x046389af UE4Editor-Slate.dylib!FSlateApplication::RoutePointerMoveEvent(FWidgetPath const&, FPointerEvent&, bool)   [UnknownFile]) 
0x045da1ba UE4Editor-Slate.dylib!FSlateApplication::ProcessMouseMoveEvent(FPointerEvent&, bool)   [UnknownFile]) 
0x0460a0a2 UE4Editor-Slate.dylib!FSlateApplication::SynthesizeMouseMove()   [UnknownFile]) 
0x04604a99 UE4Editor-Slate.dylib!FSlateApplication::TickApplication(ESlateTickType, float)   [UnknownFile]) 
0x04603296 UE4Editor-Slate.dylib!FSlateApplication::Tick(ESlateTickType)   [UnknownFile]) 
0x02aa18de UE4Editor!FEngineLoop::Tick()   [UnknownFile]) 
0x02aa97a2 UE4Editor!GuardedMain(wchar_t const*)   [UnknownFile]) 
0x02ab6e40 UE4Editor!-[UE4AppDelegate runGameThread:]   [UnknownFile]) 
0x02d56d17 UE4Editor-Core.dylib!-[FCocoaGameThread main]   [UnknownFile]) 
0x53fcb6d8 Foundation!__NSThread__start__()   [UnknownFile]) 
0x797026c1 libsystem_pthread.dylib!_pthread_body()   [UnknownFile]) 
0x7970256d libsystem_pthread.dylib!_pthread_body()   [UnknownFile]) 
0x79701c5d libsystem_pthread.dylib!thread_start()   [UnknownFile]) 

SEGV_MAPERR at 0x30

UE4Editor-UnrealEd.dylib!FEditorModeTools::MouseMove()
UE4Editor-UnrealEd.dylib!FEditorViewportClient::MouseMove()
UE4Editor-Engine.dylib!FSceneViewport::OnMouseMove()
UE4Editor-Engine.dylib!non-virtual thunk to FSceneViewport::OnMouseMove()
UE4Editor-Slate.dylib!SViewport::OnMouseMove()
UE4Editor-Slate.dylib!FSlateApplication::RoutePointerMoveEvent()
UE4Editor-Slate.dylib!FSlateApplication::ProcessMouseMoveEvent()
UE4Editor-Slate.dylib!FSlateApplication::SynthesizeMouseMove()
UE4Editor-Slate.dylib!FSlateApplication::TickApplication()
UE4Editor-Slate.dylib!FSlateApplication::Tick()
UE4Editor!FEngineLoop::Tick()
UE4Editor!GuardedMain()
UE4Editor!<Unknown>
UE4Editor-Core.dylib!<Unknown>
Foundation!Unknown()
libsystem_pthread.dylib!<Unknown>
libsystem_pthread.dylib!<Unknown>
libsystem_pthread.dylib!<Unknown>