Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x0000000000000008

I changed my Landscape Material in UEFN but then my Editor crashed, so i tried reopen UEFN but now im getting this crash everytime i try to open my Project.

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x0000000000000008

UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
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UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
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UnrealEditorFortnite_Win64_Shipping
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kernel32
ntdll