[Webkit-unassigned] [Bug 200296] New: Web Inspector: Uncaught Exception: TypeError: null is not an object (evaluating 'issueMessage.sourceCodeLocation.sourceCode')

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=200296

            Bug ID: 200296
           Summary: Web Inspector: Uncaught Exception: TypeError: null is
                    not an object (evaluating
                    'issueMessage.sourceCodeLocation.sourceCode')
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
               URL: https://www.youtube.com/user/NewOnNetflix/videos
                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://www.youtube.com/user/NewOnNetflix/videos
Loading completed:    true
Frontend User Agent:  Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15) AppleWebKit/605.1.15 (KHTML, like Gecko)

Uncaught Exceptions:
 - TypeError: null is not an object (evaluating 'issueMessage.sourceCodeLocation.sourceCode') (at DebuggerSidebarPanel.js:1406:111)
    _addIssue @ DebuggerSidebarPanel.js:1406:111
    _addIssuesForSourceCode @ DebuggerSidebarPanel.js:587:27
    _addResource @ DebuggerSidebarPanel.js:640:37
    _addResourcesRecursivelyForFrame @ DebuggerSidebarPanel.js:619:26
    DebuggerSidebarPanel @ DebuggerSidebarPanel.js:224:50
    navigationSidebarPanel @ TabContentView.js:171:87
    shown @ ContentBrowserTabContentView.js:101:17
    prepareToShow @ BackForwardEntry.js:84:35
    _showEntry @ ContentViewContainer.js:450:28
    showBackForwardEntryForIndex @ ContentViewContainer.js:166:28
    showContentView @ ContentViewContainer.js:142:42
    _tabBarItemSelected @ TabBrowser.js:238:55
    dispatch @ Object.js:165:30
    dispatchEventToListeners @ Object.js:172:17
    selectedTabBarItem @ LegacyTabBar.js:385:38
    _handleMouseDown @ LegacyTabBar.js:634:13
    _handleMouseDown @ [native code]
-------

* STEPS TO REPRODUCE
1. set a specific event listener breakpoint for every event listener on `#menu > a:nth-child(2) > paper-item > paper-item-body > div.item.style-scope.yt-dropdown-menu`.
2. disable all event listeners of every parent
3. tap the node

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