A sliding closing element for a sliding closing element arrangement of a vehicle, the sliding closing element arrangement comprising at least one rail that is adapted for slidably supporting the sliding closing element, the sliding closing element comprising at least one fail safe sliding arm assembly with at least one bogie support arm and at least one safety arm, the at least one bogie support arm comprising at least one bogie assembly with at least one guide roller that is adapted for rolling along the at least one rail in operation, and the at least one safety arm being adapted for retaining the at least one fail safe sliding arm assembly on the at least one rail in case of a failure of the at least one bogie support arm.