title: Unable to get property 'propertyName' of undefined or null reference in angular 6
body: <p>I am getting the following issue </p>
  
  <p>Unable to get property 'senderDetails' of undefined or null reference</p>
  
  <p>I am using the following code in angular 6</p>
  
  <pre><code>&lt;tr *ngIf="itemList.senderDetails?.length !=null"&gt;
  &lt;th scope="row"&gt;Sender Owner&lt;/th&gt;
  &lt;td&gt;&lt;strong&gt;ID&lt;/strong&gt;{{itemList.senderId}} |&lt;strong&gt;Name&lt;/strong&gt;{{itemList.sender}}&lt;/td&gt;
  &lt;/tr&gt;
  </code></pre>
  
  <p>the above code runs fine in chrom but it throws error of undefined or null reference in IE edge</p>