Address to coordinate in objective c in google map - objective-c

Question

I have 60 address and I want to add the pin for every address. I want to use google maps and not Apple maps. I have a loop outside, and calling this method for 100 elements.
And some times I got this error: *** -[__NSArrayI objectAtIndex:]: index 0 beyond bounds for empty array
And the error is not regular, I mean the error does not corresponds to an exact address. Sometimes I got 20 errors, sometimes 15,...
Does anyone know how to resolve it?
thank you
- (CLLocationCoordinate2D) getLocationFromAddress:(NSString*) address
{
NSError *error = nil;
NSString *lookUpString;
NSDictionary *jsonDict;
NSData *jsonResponse;
NSArray *locationArray;
lookUpString = [[NSString alloc] initWithFormat:#"http://maps.googleapis.com/maps/api/geocode/json?address=%#&sensor=true", address];
lookUpString = [lookUpString stringByReplacingOccurrencesOfString:#" " withString:#"+"];
jsonResponse = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:lookUpString]];
jsonDict = [NSJSONSerialization JSONObjectWithData:jsonResponse options:kNilOptions error:&error];
locationArray = [[NSArray alloc] init];
locationArray = [[[jsonDict valueForKey:#"results"] valueForKey:#"geometry"] valueForKey:#"location"];
#try {
locationArray = [locationArray objectAtIndex:0];
NSLog(#" LOADING, %d, %d, %d", [locationArray count], [jsonDict count], [jsonResponse length]);
}
#catch (NSException *exception) {
NSLog(#"ERROR LOADING, %d, %d, %d", [locationArray count], [jsonDict count], [jsonResponse length]);
}
#finally {
}
NSString *latitudeString = [[NSString alloc] init];
latitudeString = [locationArray valueForKey:#"lat"];
NSString *longitudeString = [[NSString alloc] init];
longitudeString = [locationArray valueForKey:#"lng"];
NSString *statusString = [[NSString alloc] init];
statusString = [jsonDict valueForKey:#"status"];
double latitude = 0.0;
double longitude = 0.0;
if ([statusString isEqualToString:#"OK"])
{
latitude = [latitudeString doubleValue];
longitude = [longitudeString doubleValue];
}
else
NSLog(#"Something went wrong, couldn't find address");
_location.longitude = longitude;
_location.latitude = latitude;
return _location;
}