title: Code working on iPhone 5, not on iPod touch 4
body: <p>I'm testing my application on different devices. The app works fine on my iPhone 5, however, when I test it on my iPod touch 4g, I get this eror:</p>
  
  <pre><code>*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '***  [__NSArrayMinsertObject:atIndex:]: object cannot be nil'
  *** First throw call stack:
  (0x33f252a3 0x3bba397f 0x33e6f8d9 0x51e25 0x35e180c5 0x35e1814d 0x35e180c5 0x35e18077 0x35e18055 0x35e1790b 0x35e17e01 0x35d405f1 0x35d2d801 0x35d2d11b 0x37a1f5a3 0x37a1f1d3 0x33efa173 0x33efa117 0x33ef8f99 0x33e6bebd 0x33e6bd49 0x37a1e2eb 0x35d81301 0x4fc8d 0x3bfdab20)
  libc++abi.dylib: terminate called throwing an exception
  </code></pre>
  
  <p>The code that's crashing is this one:</p>
  
  <pre><code>/********/
      NSMutableArray *titulosCampoTextArray = [[NSMutableArray alloc] init];
      for (int i = 0; i &lt; campos.count; i++) {
  
          SignupCell *cell = (SignupCell*)[self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:i inSection:0]];
          [titulosCampoTextArray addObject:cell.textField.text];
      }
  /********/
  </code></pre>
  
  <p>I'm using custom prototype cells (SignupCell.h), on a UITableView inside a UIView.</p>
  
  <p>Can't find the error, or how to fix it.</p>
  
  <p><strong>EDIT:</strong> Both devices are running iOS 6.1.3, and I'm using Xcode 4.6.1.</p>