[Webkit-unassigned] [Bug 215495] New: Web Inspector: Assertion Failed: removeEventListener cannot remove css-manager-style-sheet-added because it doesn't exist.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=215495

            Bug ID: 215495
           Summary: Web Inspector: Assertion Failed: removeEventListener
                    cannot remove css-manager-style-sheet-added because it
                    doesn't exist.
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                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

[Error] Assertion Failed: removeEventListener cannot remove css-manager-style-sheet-added because it doesn't exist.
        removeEventListener (Object.js:93)
        ondetach (FrameTreeElement.js:124)
        _detach (TreeElement.js:294)
        removeChildAtIndex (TreeOutline.js:341)
        removeChild (TreeOutline.js:362)
        _removeTreeElement (FolderizedTreeElement.js:257)
        removeChildForRepresentedObject (FolderizedTreeElement.js:134)
        _childFrameWasRemoved (FrameTreeElement.js:259)
        dispatch (Object.js:165)
        dispatchEventToListeners (Object.js:172)
        removeChildFrame (Frame.js:348)
        frameDidDetach (NetworkManager.js:619)
        frameDetached (PageObserver.js:47)
        _dispatchEvent (Connection.js:210)
        dispatch (Connection.js:79)
        dispatchMessageFromTarget (TargetManager.js:176)
        dispatchMessageFromTarget (TargetObserver.js:47)
        _dispatchEvent (Connection.js:210)
        dispatch (Connection.js:79)
        dispatch (InspectorBackend.js:231)
        (anonymous function) (MessageDispatcher.js:42)

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