i got a error in process model

Store Entity An error occurred while trying to write to the entity "LMT_employe" [id=bdad1b1d-6be9-4e51-a78b-016523093634@3984, type=LMT_employe (id=3590)] (data store: LMT datastore). Details: java.lang.IllegalArgumentException: The record to be saved must not be null: TypedValue[it=3590,v=<null>] Data: TypedValue[it=3590,v=<null>]

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