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        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Uncaught Exception: null is not an object (evaluating 'this.treeOutline.isXMLMimeType')"
   href="https://bugs.webkit.org/show_bug.cgi?id=169484">169484</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Uncaught Exception: null is not an object (evaluating 'this.treeOutline.isXMLMimeType')
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>WebKit
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>WebKit Nightly Build
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>URL</th>
          <td>https://webkit.org/
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>Normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P2
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>Web Inspector
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>webkit-unassigned&#64;lists.webkit.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>dcrousso+webkit&#64;gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>inspector-bugzilla-changes&#64;group.apple.com
          </td>
        </tr></table>
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        <pre>-------
Inspected URL:        <a href="https://webkit.org/">https://webkit.org/</a>
Loading completed:    true
Frontend User Agent:  Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_4) AppleWebKit/604.1.10+ (KHTML, like Gecko)
Dispatch Source:      Protocol Command Response

Protocol Command Response:
{&quot;result&quot;:{&quot;nodeId&quot;:218},&quot;id&quot;:105}

Protocol Command Request:
{&quot;id&quot;:105,&quot;method&quot;:&quot;DOM.setNodeName&quot;,&quot;params&quot;:{&quot;nodeId&quot;:131,&quot;name&quot;:&quot;h3&quot;}}

Uncaught Exceptions:
 - null is not an object (evaluating 'this.treeOutline.isXMLMimeType') (at DOMTreeElement.js:1322:76)
    _nodeTitleInfo &#64; DOMTreeElement.js:1322:76
    updateTitle &#64; DOMTreeElement.js:1162:55
    _updateModifiedNodes &#64; DOMTreeUpdater.js:123:42
    _updateModifiedNodes &#64; DOMTreeOutline.js:470:59
    changeTagNameCallback &#64; DOMTreeElement.js:1096:45
    ? &#64; DOMNode.js:806:31
    _dispatchResponseToCallback &#64; Connection.js:146:27
    _dispatchResponse &#64; Connection.js:116:45
    dispatch &#64; Connection.js:69:35
    dispatch &#64; InspectorBackend.js:154:49
    dispatchNextQueuedMessageFromBackend &#64; MessageDispatcher.js:42:34

Additional Details:
    cause --&gt; An uncaught exception was thrown while dispatching response callback for command DOM.setNodeName.
-------

* STEPS TO REPRODUCE
1. Go to &lt;<a href="https://webkit.org">https://webkit.org</a>&gt;
2. Open WebInspector
3. Enter &quot;Inspect Element&quot; mode
4. Select the element with the text &quot;WebKit for Web Developers&quot;
5. Change the type of that node (which should be &lt;h2&gt;) to a different type (such as &lt;h3&gt;)</pre>
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