Is there a Guild Member Cap?

[Polyphemos]

We have 321 and for some reason whoever i /ginvite tot he guild say they get prompted and accept, but don't join the guild. Then when I try to invite again, it says "That player has already been invited."

[Mimma]

Yes, there is a cap at (I think) 300 characters.

[dispenseri]

It's 321, like mentioned in the OP