Got a failed assertion

[Skaruts]

Hey there. Just to let you know I got this when I pressed a button on a wall, in the first level.

1529: assertion failed!
stack traceback:
    [c]: in function 'assert'
    1529 in function 'PullLever'
    1420 in function 'Interact'
    1918 in function 'TICPlay'
    1797 in function 'TIC'

I only played the game once, so I'm afraid I can't provide any more details. I don't even know how many walls with buttons there might be...

EDIT: although since you don't have the code in one file here, I suppose it helps if I point out that the assertion that failed is this one:

ticgeo3d/level.lua

Line 258 in 07fcea0

assert(gatec)