Web Service App Crash That Doesn't Happen Too Frequently - ios

Question

About a couple weeks ago, I submitted my JobSearch App to the App Store. This app uses the USA Job Search Web Service to get me the jobs in JSON data so that I can put those jobs into an array.
Anyway, my app got rejected due to a crash on the iPhone 5. I read the logs and they said
Exception Type: EXC_CRASH (SIGABRT)
So I created an exception breakpoint in my application. It turns out if I enter random garbage for my input, the web service might return me 0 jobs, and sometimes it will return SIGABRT. I found the crash at this line of my code, where I'm creating an array to hold the service:
NSMutableArray *jobsCallArray = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
I really can't find anything wrong with this code, and this is the only thing I need to fix to get my app accepted. If you would like to see how I call the service to it's entirety and all that, here is the code:
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:#"push"])
{
NSString *urlString = [NSString stringWithFormat:#"http://api.usa.gov/jobs/search.json?query=%#+jobs+in+%#", [jobDescription text], [location text]];
NSURL *url = [NSURL URLWithString:urlString];
NSData *data = [NSData dataWithContentsOfURL:url];
NSError *error;
NSMutableArray *jobsCallArray = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
NSMutableArray *positionArray = [[NSMutableArray alloc] init];
for (NSDictionary *theJob in jobsCallArray)
{
NSString *jobDesc = theJob[#"position_title"];
[positionArray addObject:jobDesc];
}
FoundJobsTableViewController *detailVC = (FoundJobsTableViewController*)segue.destinationViewController;
[detailVC setArray:positionArray];
[detailVC setTheUrlString:urlString];
}
}
All help is appreciated, thanks in advance

Answer 1

You need to check for an error and whether you're actually receiving data:
if (!error && data) {
NSMutableArray *jobsCallArray = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
}