The middle seat in my second row will not lock into the upright position. on 2006 Volvo XC90

The seat stays up with normal driving but if I have to stop suddenly it will fall forward, making it unsafe to put a passenger in. I have looked all around the seat base and can't find anything obstructing the locking mechanism.

Asked by for the 2006 Volvo XC90
1 answer
WD-40!........