Blame the addon sending messages to the wrong channel

[yoshimo]

Every now and then i stumble upon an addon that tries to use SendAddonMessage with the wrong channel as argument. This results in "you aren't in a party/raid/.." being printed repeatedly by the game.

I think there once was an addon that hooked this function and called out the offender, but the memory is too vague and i can't find it anymore.
My chatlogs also do no longer have a lua snippet of the same function.
Does anyone remember what we used back then?