[Webkit-unassigned] [Bug 192783] New: Web Inspector: Uncaught Exception: TypeError: null is not an object (evaluating 'effectiveDOMNode.enabledPseudoClasses')

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=192783

            Bug ID: 192783
           Summary: Web Inspector: Uncaught Exception: TypeError: null is
                    not an object (evaluating
                    'effectiveDOMNode.enabledPseudoClasses')
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
               URL: https://devinrousso.com/demo/WebKit/test.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:        https://devinrousso.com/demo/WebKit/test.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 'effectiveDOMNode.enabledPseudoClasses') (at GeneralStyleDetailsSidebarPanel.js:288:52)
    _updatePseudoClassCheckboxes @ GeneralStyleDetailsSidebarPanel.js:288:52
    layout @ GeneralStyleDetailsSidebarPanel.js:106:42
    _layoutSubtree @ View.js:286:20
    _visitViewTreeForLayout @ View.js:385:36
-------

* STEPS TO REPRODUCE
1. inspect a page with a ::before/::after pseudo-element
2. select the ::before/::after pseudo-element
3. refresh the page

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