It should be throwing an error; it might be in printf so you'd have to not use launcher (I know I know but I just copied much of the group code that was already there).
I've had that when there's been a crash and some old groups are stuck in the table. Open both your group_id and group_leaders table and clear out whatever's inside. See if that helps.
It's clearly having a problem selecting from the table, I'll add some better logging to it next time I patch so you can see what error it's actually throwing.
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