The error itself is within blizzards chatframe system and it doesn't directly link into where the area came from to give us a clue as to whether something was passed to it from an addon or it was a number generated off the fly.
I wouldn't be surprised though if it is a side affect of addons playing with the chatframes. I get the error once in a blue moon and usually on a character I haven't played too recently but haven't been able to track down the culprit.
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