v1.2.15 FC3 crashes with new "Previous waypoint" function

[Jinker]

I've experienced wrong behavior and crashes with the new function introduced in v1.2.15:

 

"Added previous waypoint selection with [LAlt + '~']. "

 

In navigation mode, trying to select a waypoint lower than 1, gives a nonsense 8-digit number. In landing mode, the same gives a crash to desktop.

Confirmed on the A-10A and F-15C.