More crazy Tokamak bombs :(

To disable Tokamak from running (Tokamak pause) I've set about deactivating every TOK object with this code...

If KeyDown(57)	; Key Space
	TOK_active=0
;	Stop
	For n=1 To NUM_ACTORS
		TOKRB_Active actors(n)\TOK_obj,False
	Next
EndIf

If I enable the Stop command, so the code is stopped in debug before executing, I can exit debug and it works fine on 50 Tok objects. But if I leave out the Stop command, the program crashes out with a 'Memory Access Violation' and the Debug shows n=10.

Why would execution after stopping work, where normal execution hangs at number ten?

This seem very weird...
What happens if you place a small delay instead of a stop?

Usually when I see things like this happening, it means buffer overrun of some sort or another.

A delay of 50 msecs cures things, and it seems it's a case of reading the Space key quickly afterwards - the delay stops the space being registered too quickly.

It seems like pressing the space bar too quickly, the TOKRB_Active command trips over itself. Surely this can't be the case, as the rest of the program including reading the keyboard won't occur until the TOKRB_Active is finished?

I can find a workaround thanks all, but I'd like to know what this happens if anyone has any ideas :)