[Webkit-unassigned] [Bug 192090] New: Web Inspector: Uncaught Exception: TypeError: null is not an object (evaluating 'treeElement.listItemElement.classList')

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=192090

            Bug ID: 192090
           Summary: Web Inspector: Uncaught Exception: TypeError: null is
                    not an object (evaluating
                    'treeElement.listItemElement.classList')
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
               URL: file:///Volumes/DATA/Build/Release/WebInspectorUI.fram
                    ework/Resources/Main.html
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: drousso at apple.com
                CC: inspector-bugzilla-changes at group.apple.com

-------
Inspected URL:        file:///Volumes/DATA/Build/Release/WebInspectorUI.framework/Resources/Main.html
Loading completed:    true
Frontend User Agent:  Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_4) AppleWebKit/605.1.15 (KHTML, like Gecko)

Uncaught Exceptions:
 - TypeError: null is not an object (evaluating 'treeElement.listItemElement.classList') (at TreeOutline.js:855:44)
    selectionControllerSelectionDidChange @ TreeOutline.js:855:44
    _updateSelectedItems @ SelectionController.js:391:61
    selectItem @ SelectionController.js:102:34
    selectedTreeElement @ TreeOutline.js:114:49
    selectTreeElementInternal @ TreeOutline.js:917:13
    select @ TreeElement.js:521:46
    refresh @ ThreadTreeElement.js:67:46
    onattach @ ThreadTreeElement.js:113:21
    _attach @ TreeElement.js:252:30
    appendChild @ TreeOutline.js:247:26
    _addTarget @ DebuggerSidebarPanel.js:741:47
    DebuggerSidebarPanel @ DebuggerSidebarPanel.js:215:28
    navigationSidebarPanel @ TabContentView.js:171:87
    showRepresentedObject @ ContentBrowserTabContentView.js:229:17
    showRepresentedObject @ Main.js:1221:41
    _treeSelectionDidChange @ ResourceSidebarPanel.js:480:37
    dispatch @ Object.js:170:30
    dispatchEventToListeners @ Object.js:177:17
    _dispatchSelectionDidChangeEvent @ TreeOutline.js:1101:38
    selectionControllerSelectionDidChange @ TreeOutline.js:863:46
    _updateSelectedItems @ SelectionController.js:391:61
    selectItem @ SelectionController.js:102:34
    handleItemMouseDown @ SelectionController.js:265:28
    _handleMouseDown @ TreeOutline.js:1037:54
    _handleMouseDown @ [native code]
-------

* STEPS TO REPRODUCE
1. open inspector^2
2. set a breakpoint somewhere that will be hit
3. wait for the breakpoint to be hit

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