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The "GuardTile" at the end is unrecognized, despite being in the definitions file. If I put it in brackets, the error goes away, but you already know what happens then. Replacing "GuardTile" with the code it should be using, [03030920], works fine, gives no errors, and uses the correct AI for the character.
That mostly worked. Removing all the AI removed the crash, but for some reason, the assembler wouldn't recognize any AI definitions other than NoAI, and would give me an error when assembling. I tried to fix this but can't seem to do it, but writing the AI out without definitions (i.e. [03030920] for "GuardTile") seems to work just fine.
If you know the issue here then that's great, as it will make it easier, but if you don't its fine, since it works at least.