[Webkit-unassigned] [Bug 190966] New: Web Inspector: Uncaught Exception: undefined is not an object (evaluating 'this._classListContainer.children')

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=190966

            Bug ID: 190966
           Summary: Web Inspector: Uncaught Exception: undefined is not an
                    object (evaluating
                    'this._classListContainer.children')
           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)
Dispatch Source:      Protocol Event

Protocol Event:
{"method":"DOM.attributeModified","params":{"nodeId":161,"name":"class","value":"mac-platform mojave latest-mac web show-invalid-characters show-whitespace-characters docked bottom meta-key-pressed"}}

Uncaught Exceptions:
 - undefined is not an object (evaluating 'this._classListContainer.children') (at GeneralStyleDetailsSidebarPanel.js:357:40)
    _populateClassToggles @ GeneralStyleDetailsSidebarPanel.js:357:40
    _handleNodeAttributeModified @ GeneralStyleDetailsSidebarPanel.js:301:39
    dispatch @ Object.js:170:30
    dispatchEventToListeners @ Object.js:177:17
    _attributeModified @ DOMManager.js:175:38
    attributeModified @ DOMObserver.js:47:41
    dispatchEvent @ InspectorBackend.js:298:42
    _dispatchEvent @ Connection.js:193:32
    dispatch @ Connection.js:71:32
    dispatch @ InspectorBackend.js:152:49
    dispatchNextQueuedMessageFromBackend @ MessageDispatcher.js:42:34

Additional Details:
    cause --> An uncaught exception was thrown while handling event: DOM.attributeModified
-------

I was unable to reliably reproduce this.  I just opened inspector2 and was shown this error.

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