Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
You are not providing enough information. Look at the debugger when it's crashing, and post what it shows.
 
Delegate release

the most possible reason will be your table view delegate will be getting released somewhere.If you are calling the table view class from another class the there you retain the class containing the table view
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.