Get an error when running insectoids.bmx example

Program crashes when player gets killed at this line --

If num_flying=0 And bbExplosion(Explosion_list.First())=Null

unhandled exception illegal operation on empty list ..

Any idea why ?

Thanks,

.bmx means Blitzmax. bb means Blitz3d.
Blitz3d can't run Blitzmax.
Blitzmax can't run Blitz3d.

This program is one of the example file of the blitz3dsk running in blitzMax

perhaps re-posting it in the b3dsdk programming or bug reports forum would be better