On 5/11/21, four filler operators were performing a changeover on the filler. The injured operator entered the filler to change chucks using portable steps with a handrail. Another operator was walking up and down the steps handing parts for the changeover. When the injured operator exited the filler using the seal of the door and stepped forward onto the portable steps, the steps slid causing the injured operator to fall back next to the filler. The injured operator hit their head on the filler door and then on the floor three feet below. The operator was hospitalized for a concussion.