Backend 500 Error: User Branch Not Assigned (NullPointerException) [closed]

I'm working on a kitchen design project and all orders are expected to show on the history table with their status changing along with the progress of the order but they aren't. This is the error message I keep getting from console; Failed to load resource: the server responded with a status of 500 ()Understand this errorAI

authentication.service.ts:128 Backend returned code 500, body was: {"httpStatus":500,"exception":"NullPointerException","message":"Cannot invoke \"com.centrifugegroup.optimax.app.user_branch.UserBranch.getBranch()\" because \"ub\" is null","fieldErrors":null}

handleError @ authentication.service.ts:128Understand this errorAI

app.component.ts:206 Error fetching user branch info: 500

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