EXC_BAD_ACCESS with NSNumber

[architectpianist]

Hi, I can't figure out why this code is giving an EXC_BAD_ACCESS. I've tried retaining, casting, and removing the "intValue" on the NSNumbers to no avail. What am I doing wrong?

-(IBAction)startCalc:(id)sender
{
	if (timer == nil) 
	{
		timer = [NSTimer scheduledTimerWithTimeInterval:0.75 target:self selector:@selector(updateProbability) userInfo:nil repeats:YES];
	}
	if (count == nil) 
	{
		count = [NSMutableArray array];
		for (int i = 0; i < range; i++)  //Range is non-zero
		{
			[count addObject:[NSNumber numberWithInt:0]];
		}
	}
}

-(void)updateProbability
{
	NSLog(@"Updating: %i", range);
	int i = rand() % range;
	NSLog(@"%i", i);
	NSLog(@"Should be %@ or %i", [count objectAtIndex:i], [[count objectAtIndex:i] intValue]); //Gives error here or on below line when NSLog is not present
	int j = [[count objectAtIndex:i] intValue];
	NSLog(@"J: %i", j);
	j++;
	[count replaceObjectAtIndex:i withObject:[NSNumber numberWithInt:j]];
	[self setPercentagesAndUpdate];
}

[Brandt]

What does the stack trace say?

[baja_yu]

You aren't using a property when assigning an object to 'count', and you are assigning it an autoreleased object. It's probably being released by the time you want to use it. Use properties.