Thread:Project:Support desk/Is this extension safe/stable, also, could someone please evaluate the stability of it?/reply (4)

I haven't tested or looked at the code, but it's I expect that one of two things happens for nonexistent users: 1 is the best and most likely occurrence. 2 isn't ideal, but it's harmless.
 * 1) It uses user ID 0, like the software normally does for anons and nonexistent users.
 * 2) It causes a fatal error before it gets a chance to change anything.

So it should be fine in that regard.