[Webkit-unassigned] [Bug 224192] New: Web Inspector: Uncaught Exception: undefined is not an object (evaluating 'console.assert(listenersForEventType, this, eventType, listener, thisObject)')

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=224192

            Bug ID: 224192
           Summary: Web Inspector: Uncaught Exception: undefined is not an
                    object (evaluating
                    'console.assert(listenersForEventType, this,
                    eventType, listener, thisObject)')
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
               URL: https://devinrousso.com/demo/WebKit/bipbop-cc-subtitle
                    s-chapters.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

Uncaught Exception in Web Inspector.

Steps to Reproduce:
0. make sure the Sources Tab is selected before Web Inspector is opened
1. inspect <https://devinrousso.com/demo/WebKit/bipbop-cc-subtitles-chapters.html>
2. switch to the Elements Tab

Uncaught Exceptions:
-----------------------
 - undefined is not an object (evaluating 'console.assert(listenersForEventType, this, eventType, listener, thisObject)') (at Object.js:84:23)
    removeEventListener @ Object.js:84:23
    ondetach @ DOMTreeElement.js:462:51
    _detach @ TreeElement.js:294:26
    removeChildAtIndex @ TreeOutline.js:341:22
    _updateChildren @ DOMTreeElement.js:558:36
    _updateChildren @ [native code]
    mycallback @ DOMNode.js:604:25
    mycallback @ [native code]
    _dispatchResponseToCallback @ Connection.js:152:27
    _dispatchResponse @ Connection.js:122:45
    dispatch @ Connection.js:77:35
    dispatchMessageFromTarget @ TargetManager.js:176:39
    dispatchMessageFromTarget @ TargetObserver.js:47:51
    _dispatchEvent @ Connection.js:210:26
    dispatch @ Connection.js:79:32
    dispatch @ InspectorBackend.js:232:52
    ? @ MessageDispatcher.js:42:34

Additional Details:
    cause --> An uncaught exception was thrown while dispatching response callback for command DOM.requestChildNodes.
-----------------------

Notes:
Inspected URL:        https://devinrousso.com/demo/WebKit/bipbop-cc-subtitles-chapters.html
Loading completed:    true
Frontend User Agent:  Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko)
Dispatch Source:      Protocol Event

Protocol Event:
{"method":"Target.dispatchMessageFromTarget","params":{"targetId":"page-23","message":"{\"result\":{},\"id\":215}"}}
Dispatch Source:      Protocol Command Response

Protocol Command Response:
{"result":{},"id":215}

Protocol Command Request:
{"id":215,"method":"DOM.requestChildNodes","params":{"nodeId":47}}

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