"ROLLOVER DATA ERROR" text in-game

I played some custom games today, and suddenly I got this text over a flag instead of the usual one:

Error

The flag itself was in the Fog of War, and an enemy Demigod were capturing it. When it was fully captured the text changed to the usual ^^

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Reply #2 Top

This one has been around since beta, far from critical, but it should also be an easy fix.  Any lua modder wanna solve this one?