EXC_BAD_ACCESS when clicking back button in navigation controller - ios

Question

I have a strange problem with back button in NavigationController. If I use parser and then I click Back button, I get EXC_BAD_ACCESS. Why?
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
_lbRouteNum.text = self.RouteNumber;
self.InfoTableView.dataSource = self;
self.InfoTableView.delegate = self;
lbCity = [[NSMutableArray alloc] initWithCapacity:1];
// [lbCity addObject:#"sdfsdfsdfsdfsd"];
NSData * XMLData = [self.response dataUsingEncoding:NSUnicodeStringEncoding];
NSXMLParser * parser = [[NSXMLParser alloc] initWithData:XMLData];
[parser setDelegate:self];
[parser parse];
}
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI: (NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDict
{
if ([elementName isEqualToString:#"Citys"])
{
//do something
}
}
If I comment this
//NSData * XMLData = [self.response dataUsingEncoding:NSUnicodeStringEncoding];
//NSXMLParser * parser = [[NSXMLParser alloc] initWithData:XMLData];
//[parser setDelegate:self];
//[parser parse];
and for test uncomment this
[lbCity addObject:#"sdfsdfsdfsdfsd"];
all working good.
If I change parsing code for test on:
if ([elementName isEqualToString:#"Citys"])
{
[lbCity addObject:#"sdfsdfsdfsdfsd"];
}
2 times all open an back ok on 3rd when I click Back button App crash with EXC_BAD_ACCESS (
Solution:
I move to ARC and all problems gone. Thanks.