As far as I understand 1.18 introduces a more thorough policy regarding enforcing closed door. So if your door sensor does not work, most likely this blocks your laser. You either need to repair your door sensor (should not be too complicated, in most cases its problems with the magnet alignment), or unplug the enclosure. Or downgrade firmware, obviously.
Perhaps this helps you to repair your sensor: Warning: Security issue - Enclosure door detection not checked at start/not fail safe - #3 by Hauke