Cannot read null.overlays

ID:261505
 
May 21 2002, 2:00 pm
mob/proc/Cast_Ice(mob/M in oview(5))
if(usr.MP>=10)
usr.MP-=10
M.overlays+=/obj/snow
sleep(100)
Lock(M)
M.overlays-=/obj/snow
M.overlays+=/obj/ices
sleep(200)
M.overlays-=/obj/ices
Unlock(usr)


That's my code but I get a runtime error that says cannot read null.overlays

any ideas?
May 21 2002, 2:31 pm
It seems like the problem is where the proc is called, not within the proc itself. It looks like the proc was not given an argument. Either you typed just Cast_Ice() with nothing in the (), or the var you put in the () is null. (BTW, I'm not sure what the "in oview(5)" part does for a proc.)

I would not advise using usr in a proc. It might be fine in a verb, but not a proc.