Crash when connection was lost

[Allui]

#pragma mark - Downloading the APPINFO JSON FILE
-(void)downloadAppInfoFile{
    NSError *error;
    NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:stringDBAppInfoURL] options:NSDataReadingUncached error:&error];
    if(error)
    {
        NSLog(@"AppUpadterNotifier - Error while downloading the app info -----%@",error);
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
            [self downloadAppInfoFile];
        });
    }
    [self parseJSONDataIntoDictinory:data];
}

The method [self parseJSONDataIntoDictinory:data]; invokes crash because data is nil when connections is lost