title: Angular 4.0.3: Uncaught TypeError: Cannot read property 'apply' of undefined
body: <p>After upgrading my <code>Angular 4.0.2</code> application to <code>Angular 4.0.3</code>, I get the following error in the Chrome console:</p>
  
  <pre><code>zone.js:1265 Uncaught TypeError: Cannot read property 'apply' of undefined
      at XMLHttpRequest.desc.get [as ontimeout] (zone.js:1265)
      at XHRLocalObject.AbstractXHRObject._cleanup (abstract-xhr.js:149)
      at XMLHttpRequest.xhr.onreadystatechange (abstract-xhr.js:125)
      at XMLHttpRequest.wrapFn (zone.js:1230)
      at ZoneDelegate.invokeTask (zone.js:398)
      at Zone.runTask (zone.js:165)
      at XMLHttpRequest.ZoneTask.invoke (zone.js:460)
  </code></pre>