Constant Editor Crashes - Assertion failed: (Index >= 0) & (Index < ArrayNum)

Development Programming & Scripting
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1

Every time I build my source code, Unreal Editor crashes. The build is successful and if I reopen the editor everything runs as it should.

Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:D:\build++UE5\Sync\Engine\Source\Runtime\Core\Public\Containers\Array.h] [Line: 691] Array index out of bounds: 300 from an array of size 0

UnrealEditor_ControlRig
UnrealEditor_ControlRig
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
kernel32
ntdll