title: How can I check if an object in an NSArray is NSNull?
body: <p>I am getting an array with null value. Please check the structure of my array below:</p>
  
  <pre><code> (
      "&lt; null&gt;"
   )
  </code></pre>
  
  <p>When I'm trying to access index 0 its crashing because of</p>
  
  <pre><code>-[NSNull isEqualToString:]: unrecognized selector sent to instance 0x389cea70
  </code></pre>
  
  <p>Currently its crashing because of that array with a crash log:</p>
  
  <pre><code> *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSNull isEqualToString:]: unrecognized selector sent to instance 0x389cea70'
  *** First throw call stack:
  (0x2d9fdf53 0x3820a6af 0x2da018e7 0x2da001d3 0x2d94f598 0x1dee57 0x1dfd31 0x302f598d 0x301a03e3 0x3052aeed 0x3016728b 0x301659d3 0x3019ec41 0x3019e5e7 0x30173a25 0x30172221 0x2d9c918b 0x2d9c865b 0x2d9c6e4f 0x2d931ce7 0x2d931acb 0x3262c283 0x301d3a41 0xabb71 0xabaf8)
  libc++abi.dylib: terminating with uncaught exception of type NSException
  </code></pre>