title: Firebase Analytics event logging error
body: <p>I use Firebase Analytics and my app logs some events with this code:</p>
  
  <pre><code>Bundle bundle = new Bundle();
  bundle.putString(FirebaseAnalytics.Param.ITEM_ID, "SOME_ID")
  bundle.putString(FirebaseAnalytics.Param.CONTENT_TYPE, "SOME_TYPE");
  mFirebaseAnalytics.logEvent(FirebaseAnalytics.Event.SELECT_CONTENT, bundle);
  </code></pre>
  
  <p>And it seem to work well most of the time. In logcat I have something like this:</p>
  
  <pre><code>Logging event (FE): select_content, Bundle[{_o=app, content_type=SOME_TYPE, item_id=SOME_ID}]
  </code></pre>
  
  <p>But for some events I receive </p>
  
  <pre><code>Logging event (FE): select_content, Bundle[{_o=app, _ev=item_id, _err=4, content_type=SOME_TYPE}]
  </code></pre>
  
  <blockquote>
    <p>Apparently, _err=4 is some kind of error code. What does it mean?</p>
  </blockquote>
  
  <p>In that cases with error my <code>item_id</code> was a pretty long string (20-30 symbols). Maybe there is a limitation on the length of the <code>item_id</code>?</p>