A woman who was looking for the restroom mistakenly opened the aircraft’s emergency exit while the Pakistan International Airlines (PIA) plane was still sitting on the runway. According to a report from Gulf News, Flight PK 702 from Manchester to Islamabad was evacuated after the incident, causing a seven-hour delay. The carrier said it was investigating the incident further.

“As per standard operating procedure, the PIA had to offload nearly 40 passengers and their luggage,” said a PIA spokesperson while speaking to reporters, according to Gulf News.

The aircraft in question is reportedly a Boeing 777, and the incident will set the airline back several thousand dollars to refit the emergency exit with a new inflatable slide. In 2016, a disgruntled flight attendant for United Airlines deliberately opened an emergency exit on a Boeing 737 while the plane was still on the runway. That incident cost United upwards of $30,000 in repairs, reports Business Insider, and the aircraft was out of service until work was complete.

Luckily, the incident in Manchester seems to be a result of confusion, not aggression. However, just one month ago, a passenger on a Ryanair flight went berserk during the trip and threatened to open a cabin door while in flight. However, before he could get to the door, several passengers tackled the man and held him down until the aircraft could land.