Bug 169484 – Uncaught Exception: null is not an object (evaluating 'this.treeOutline.isXMLMimeType')

• Status: RESOLVED
• Resolution: WORKSFORME
• Component: Web Inspector

[Devin Rousso]

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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>)

[Blaze Burg]

While the bug makes me sad, I am impressed at the details we were able to auto generate!

[Blaze Burg]

Devin, I can't reproduce this. How did you change the tag name? I tried Edit as HTML and nothing bad happened.

[Devin Rousso]

(In reply to Brian Burg from comment #2)
> Devin, I can't reproduce this. How did you change the tag name? I tried Edit
> as HTML and nothing bad happened.
Double click on the tag name in the DOM tree.  I just tried it again, and I am not seeing this exception.