A central Iowa city bus driver had a bad day on Thursday. The driver of the Des Moines Area Regional Transit bus got out of the empty bus in Altoona to help a passenger using a walker get on.

Before she could help the passenger though, the bus door slammed shut and trapped the driver, 33-year-old Limanda Johnson of Des Moines. When the doors shut, the brakes released and the bus started rolling. Johnson had to hop on one leg as the bus lurched about 150 feet and hit a tree. Johnson was treated and released for back and knee injuries. She’s on paid leave as the incident is investigated.