[Webkit-unassigned] [Bug 169484] New: Uncaught Exception: null is not an object (evaluating 'this.treeOutline.isXMLMimeType')

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=169484

            Bug ID: 169484
           Summary: Uncaught Exception: null is not an object (evaluating
                    'this.treeOutline.isXMLMimeType')
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
               URL: https://webkit.org/
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dcrousso+webkit at gmail.com
                CC: inspector-bugzilla-changes at group.apple.com

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Inspected URL:        https://webkit.org/
Loading completed:    true
Frontend User Agent:  Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_4) AppleWebKit/604.1.10+ (KHTML, like Gecko)
Dispatch Source:      Protocol Command Response

Protocol Command Response:
{"result":{"nodeId":218},"id":105}

Protocol Command Request:
{"id":105,"method":"DOM.setNodeName","params":{"nodeId":131,"name":"h3"}}

Uncaught Exceptions:
 - null is not an object (evaluating 'this.treeOutline.isXMLMimeType') (at DOMTreeElement.js:1322:76)
    _nodeTitleInfo @ DOMTreeElement.js:1322:76
    updateTitle @ DOMTreeElement.js:1162:55
    _updateModifiedNodes @ DOMTreeUpdater.js:123:42
    _updateModifiedNodes @ DOMTreeOutline.js:470:59
    changeTagNameCallback @ DOMTreeElement.js:1096:45
    ? @ DOMNode.js:806:31
    _dispatchResponseToCallback @ Connection.js:146:27
    _dispatchResponse @ Connection.js:116:45
    dispatch @ Connection.js:69:35
    dispatch @ InspectorBackend.js:154:49
    dispatchNextQueuedMessageFromBackend @ MessageDispatcher.js:42:34

Additional Details:
    cause --> An uncaught exception was thrown while dispatching response callback for command DOM.setNodeName.
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* STEPS TO REPRODUCE
1. Go to <https://webkit.org>
2. Open WebInspector
3. Enter "Inspect Element" mode
4. Select the element with the text "WebKit for Web Developers"
5. Change the type of that node (which should be <h2>) to a different type (such as <h3>)

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