[Q]

Most important: are you playing a turn based or a simultaneous game??
In a turn based game you can determine and eliminate the error by switching the AI player that causes the error to human control, activate all ministers and watch the turn till the error occurs.
In a simultaneous game that's much more difficult. As said the only thing you can do is to make some random changes of the AI turn by switching some ministers on or off. If the error occurs when you do nothing at all and all ministers are turned off then the game is probably lost.
If you can dertermine the cause of the range check error don't forget to mail it to MM.
Hope this helps and good luck!