Unreal engine 4 crashes on saving third person character blueprint

I created a UUserWidget with edit anywhere property. when i set that widget from editor in my in-game character, everything is fine but my game has 10 levels so i cant set that on each on my levels individually. So i decided to edit Third person Character blueprint. When i set UUserWidget there and save it, it comes as far as 50% and crashes. but When i save that blueprint without setting UUserWidget no crash is happening.
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