Special Situation

In my last game at the Championship, at the begining, once I had my word (a Scrabble btw), I released I had 8 letters instead of 7... what to do then? We had to call the Referi, but the situation wasn´t considered at the rules... so finally the Referi decided the solution should be to put down the letters and my opponent to take out one randomly. We were agree. :)