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      <base href="https://bugs.webkit.org/" />
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        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Web Inspector: Uncaught Exception: undefined is not an object (evaluating 'this._selectorSection.update')"
   href="https://bugs.webkit.org/show_bug.cgi?id=159787">159787</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Web Inspector: Uncaught Exception: undefined is not an object (evaluating 'this._selectorSection.update')
          </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>http://n12v.com/
          </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>nvasilyev&#64;apple.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>bburg&#64;apple.com, joepeck&#64;webkit.org, mattbaker&#64;apple.com, nvasilyev&#64;apple.com, timothy&#64;apple.com, webkit-bug-importer&#64;group.apple.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>-------
Inspected URL:        <a href="http://n12v.com/">http://n12v.com/</a>
Loading completed:    true
Frontend User Agent:  Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_5) AppleWebKit/602.1.41+ (KHTML, like Gecko)

Uncaught Exceptions:
 - undefined is not an object (evaluating 'this._selectorSection.update') (at VisualStyleDetailsPanel.js:64:34)
    refresh &#64; VisualStyleDetailsPanel.js:64:34
    _refreshPreservingScrollPosition &#64; StyleDetailsPanel.js:143:21
    nodeStylesRefreshed &#64; StyleDetailsPanel.js:114:50
    dispatch &#64; Object.js:162:30
    dispatchEventToListeners &#64; Object.js:169:17
    fetchedComputedStyle &#64; DOMNodeStyles.js:228:42
    fetchedComputedStyle &#64; [native code]
    _dispatchResponseToCallback &#64; InspectorBackend.js:311:27
    _dispatchResponse &#64; InspectorBackend.js:281:45
    dispatch &#64; InspectorBackend.js:157:35
    dispatchNextQueuedMessageFromBackend &#64; MessageDispatcher.js:42:34

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

* STEPS TO REPRODUCE
1. Open <a href="http://n12v.com">http://n12v.com</a>
2. Select Elements tab
3. Select &quot;Styles — Visual&quot;</pre>
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