Ford Motor Co. has instructed its dealers to stop selling the electric Mustang Mach-e because a software defect could lock the doors, potentially trapping occupants inside.

Owners primed to collect their brand-new Mustang Mach-Es have been turned away by dealers after Ford issued a stop-sale notice due to the crossover’s defective door lock software, which can lead to entrapment. Existing cars will soon be hit with a recall to remedy the same issue.