-[NSNull length]: unrecognized selector sent to JSON objects

Question

I\'m developing an iOS 5.0+ app with latest SDK.

I get a very strange error with this code:

- (NSMutableURLRequest*)setupRequestWithService:(NSString         


        

Answer 1

The error message is pretty clear. NSNull and nil are different things:

The NSNull class defines a singleton object used to represent null values in 
collection objects (which don’t allow nil values).

If you want to check if authenticationToken is NSNull try: [authenticationToken isEqual: [NSNull null]]