[Thomas.]

You are probably already using the same dialog ID in another script (perhaps your gamemode) and thus most likely not returning 0, or you are not returning 0 in the callback in your other script(s) at all (even when no matching code was found).

Quote from wiki:

Quote:

Returning 0 in this callback will pass the dialog to another script in case no matching code were found in your gamemode's callback.

If the same callback in another script does not return 0, it will never reach this filterscript.