Make sure you add the +1 influence to all instances of winning the Olympics, not just the one in the thread.

Failing that: when exactly does it CTD? Is it as soon as you hit end turn, or during an AI turn? What season is it (look at your leader's traits to get the exact season)? Have you tried adding "console_command control x" (where x is another faction) to the EBBS.txt file to see if it gets around the CTD?