Ryanair passenger Ann-Marie Murray found herself escorted off of a flight by police after trying to purchase Pringles onboard using her Barclays credit card.

The airline’s payment system failed on a flight from Tenerife, Spain to Bristol, U.K. on March 28. She’d already eaten the snacks, also including water and a soda. She couldn’t cover the £7 (US$9) bill, and the airline repeatedly couldn’t get her card to go through. So they called the police.