UE4 Keeps crashing error

Hi,

I keep getting this error and not sure what it is due to - it occurs randomly while usually while moving trhrough the map but sometimes even as i open the project - in that case my only solution is to revert back to older saves to get rid of it - but eventually no matter what i do it comes back. Any idea what the problem might be and how to solve it, this is very important thanks. Here is the log:

Assertion failed: FVector::Distance(InitOptions.ViewRotationMatrix.GetScaleVector(), FVector::OneVector) < (1.e-4f) [File:D:/Build/++UE4+Licensee/Sync/Engine/Source/Runtime/Engine/Private/SceneView.cpp] [Line: 471]

UE4Editor_Core
UE4Editor_Core
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_UnrealEd
UE4Editor_UnrealEd
UE4Editor_UnrealEd
UE4Editor_Engine
UE4Editor_UnrealEd
UE4Editor_UnrealEd
UE4Editor_UnrealEd
UE4Editor
UE4Editor
UE4Editor
UE4Editor
UE4Editor
kernel32
ntdll

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