Cocos2D bug

HelloWorldLayer.h

//
//  HelloWorldLayer.h
//  CocosTest
//
//  Created by Asad ur Rehman on 8/10/11.
//


// When you import this file, you import all the cocos2d classes
#import "cocos2d.h"

// HelloWorldLayer
@interface HelloWorldLayer : CCLayer
{
}

// returns a CCScene that contains the HelloWorldLayer as the only child
+(CCScene *) scene;

@end

HelloWorldLayer.m

//
//  HelloWorldLayer.m
//  CocosTest
//
//  Created by Asad ur Rehman on 8/10/11.
//


// Import the interfaces
#import "HelloWorldLayer.h"

// HelloWorldLayer implementation
@implementation HelloWorldLayer

+(CCScene *) scene
{
	// 'scene' is an autorelease object.
	CCScene *scene = [CCScene node];
	
	// 'layer' is an autorelease object.
	HelloWorldLayer *layer = [HelloWorldLayer node];
	
	// add layer as a child to scene
	[scene addChild: layer];
	
	// return the scene
	return scene;
}

// on "init" you need to initialize your instance
-(id) init
{
	// always call "super" init
	// Apple recommends to re-assign "self" with the "super" return value
	if( (self=[super init])) {
		
		// create and initialize a Label
		CCLabelTTF *label = [CCLabelTTF labelWithString:@"Hello World" fontName:@"Marker Felt" fontSize:64];

		// ask director the the window size
		CGSize size = [[CCDirector sharedDirector] winSize];
	
		// position the label on the center of the screen
		label.position =  ccp( size.width /2 , size.height/2 );
		
		// add the label as a child to this Layer
		[self addChild: label];

		// this will cause an infinite loop of "Sup" being printed to the console
		[self runAction:[CCSequence actions:
						 [CCDelayTime actionWithDuration:0.3f],
						 [CCCallFunc actionWithTarget:self selector:@selector(sup)],
						 nil]];
	}
	return self;
}

- (void)sup {
	CCLOG(@"Sup");
	
	NSMutableArray *arr = [NSMutableArray arrayWithObjects:@"Hello", @"World", @"WTF", @"OMG", @"n00b", @"STFU", nil];
	
	for(id a in arr)
		if([a isEqual:@"Hello"])
			[arr removeObject:a]; /* this will throw an exception */
	
	CCLOG(@"This will never reach here");
}

// on "dealloc" you need to release all your retained objects
- (void) dealloc
{
	// in case you have something to dealloc, do it in this method
	// in this particular example nothing needs to be released.
	// cocos2d will automatically release all the children (Label)
	
	// don't forget to call "super dealloc"
	[super dealloc];
}
@end