I'll have a look at it. Seems to be the keybindings again
oh btw: It should happen as you move the mouse over a name of a guild member OR as you moved the mouse over a name and then somwhere else (mouse exit event of the member name)!
edit:
Just to be sure Tony, coudl you please disable all other addons and check if the error happens again? I'm not able to reproduce the keybind error here at my client so far
Maybe one of your 100000 addons is interfering again
If you enable other addons start wih the ones for guild stuff to see if this throws the error then.
Tahnks