Google Analytics SDK iOS10
<p>I have installed Google Analytics from cocoa pod version 3.14</p>

<pre><code>id&lt;GAITracker&gt; tracker =  [[GAI sharedInstance] trackerWithTrackingId:oneTrackId];
</code></pre>

<p>crash on iOS 10 in code line </p>

<pre><code>NSString *user_id = [tracker get:kGAIUserId];
</code></pre>

<blockquote>
  <p>Error 
  <strong>* Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*</strong> -[GAITrackerModel
  valueForKey:]: attempt to retrieve a value for a nil key'</p>
</blockquote>