Well, The only thing I can think of that would stop a timestop would be a anti-magic shell if such existed in the game. In the Ad&d world, a anti magic shell which blocked all magic would probably cancel a timestop spell if it was in the area of affect, thus a timestop wouldn't work.
But the game rules do say that a Timestop spell is a AREA spell, not a individual spell. You are casting a Timestop shell that covers the area, freezing everyone in time except yourself. Its not a spell that simply takes you out of time to make faster actions, so a creature that magic didn't work on at all might not be affected by a 9th level spell.
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