186121 MySQl /PHP Needs fixing

This is somewhat of an emergency. Recently my website started receiving a MySQL error (recently means within the last couple of hours). This script has been running stable for 3 years, now some errant data seems to be causing a problem. Check out [login to view URL] and try to review a category (left side of screen). The MySQl error message appears to reflect a file recently posted. I have deleted the file, but the problem reamins. My programming staff is of on holiday for a week (it figures!) This needs to be fixed ASAP, along with exact details on what is done to fix the problem, as well as an overview of what caused the problem