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        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Uncaught Exception: TypeError: null is not an object (evaluating 'child.treeOutline._rememberTreeElement')"
   href="https://bugs.webkit.org/show_bug.cgi?id=159752">159752</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Uncaught Exception: TypeError: null is not an object (evaluating 'child.treeOutline._rememberTreeElement')
          </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://www.zillow.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>benjamin&#64;webkit.org
          </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>
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        <pre>-------
Inspected URL:        <a href="http://www.zillow.com/">http://www.zillow.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:
 - TypeError: null is not an object (evaluating 'child.treeOutline._rememberTreeElement') (at TreeOutline.js:211:26)
    insertChild &#64; TreeOutline.js:211:26
    onpopulate &#64; SourceCodeTreeElement.js:123:46
    traverseNextTreeElement &#64; TreeElement.js:555:31
    _updateFilter &#64; NavigationSidebarPanel.js:617:80
    updateFilter &#64; NavigationSidebarPanel.js:329:27
    _scopeBarSelectionDidChange &#64; ResourceSidebarPanel.js:392:26
    dispatch &#64; Object.js:162:30
    dispatchEventToListeners &#64; Object.js:169:17
    _itemSelectionDidChange &#64; ScopeBar.js:157:38
    dispatch &#64; Object.js:162:30
    dispatchEventToListeners &#64; Object.js:169:17
    setSelected &#64; ScopeBarItem.js:88:38
    selected &#64; ScopeBarItem.js:77:25
    _itemSelectionDidChange &#64; ScopeBar.js:146:25
    dispatch &#64; Object.js:162:30
    dispatchEventToListeners &#64; Object.js:169:17
    setSelected &#64; ScopeBarItem.js:88:38
    selected &#64; ScopeBarItem.js:77:25
    selectedScopeBarItem &#64; MultipleScopeBarItem.js:137:39
    _selectElementSelectionChanged &#64; MultipleScopeBarItem.js:178:13
    _selectElementSelectionChanged &#64; [native code]
-------

* STEPS TO REPRODUCE
1. Opened Resource view
2. I was switching between resource types in the left sidebar</pre>
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