Line of code causes crash in instruments but not in Xcode

Question

BOOL continueLoop;
CGPoint thePoint; 

while(continueLoop != NO)
{
 continueLoop = NO;

 thePoint = [self generateRandomLocation];

 NSMutableArray *blocks = [self getBlocksForX:thePoint.x];

 for(BlueBlock *block in blocks)
 {
  if(block.getBlockLocationY == thePoint.y)
  {
   continueLoop = YES;
  }
 }
 [blocks release];
}

This causes a crash when ran in instruments but not in Xcode. I narrowed the problem down, it happens when this line of code is in a loop... NSMutableArray *blocks = [self getBlocksForX: thePoint.x]; the method returns a NSMutableArray, I store it in blocks each time the loop is executed then at the end of the loop I release it. What would be causing instruments to crash?

Answer 1

since you never alloc, copy, or retain blocks you should not be releasing it.

It may help for errors like this to run the static analyzer.