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Today I found a new OSI bug in the demo.

I've documented the getItemAtSlot function at our wiki : . While documenting I realized there was something not right.

I've used Python (using uodmp ) to verify this bug. I do not believe the bug can be triggered through normal gameplay.

getItemAtSlot crash bug

UO Demo getItemAtSlot.png (28.38 KiB) Viewed 20322 times

Interesting that in my packet guide, layer 30 (0x1E) is listed as "Shop Max".
I'll try to dig where was the source of this information.

Maybe it functions different when applied to the vendor mobile instead of the player mobile, but they have forgot to check that object is not player when layer is 30?

Classic range check typo then.
Haven't found source of my information.
In all runuo versions I have, 0x1D (Bank) is the last valid one. (so it was not the source)

Just found it too =)