[Webkit-unassigned] [Bug 202862] New: Uncaught Exception: undefined is not an object (evaluating 'child.chunkSize')

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=202862

            Bug ID: 202862
           Summary: Uncaught Exception: undefined is not an object
                    (evaluating 'child.chunkSize')
           Product: WebKit
           Version: Safari 12
          Hardware: All
               URL: http://127.0.0.1:8000/media/W3C/audio/events/event_pro
                    gress.html
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: peng.liu6 at apple.com
                CC: inspector-bugzilla-changes at group.apple.com

Uncaught Exception in Web Inspector.

Steps to Reproduce:
1. Setup a local web server for the layout test, and open the url for media/W3C/audio/events/event_progress.html.
2. Open the Web Inspector, set a breakpoint inside the event handler.
3. Press "Option + Command + R" to reload the test page multiple times until you see the Web Inspector internal error.

Uncaught Exceptions:
-----------------------
 - undefined is not an object (evaluating 'child.chunkSize') (at codemirror.js:375:48)
    getLine @ codemirror.js:375:48
    clipPos @ codemirror.js:473:32
    getRange @ codemirror.js:5776:41
    ? @ TextEditor.js:1354:49
    ? @ SourceCodeTextEditor.js:1430:25
    makeSyntaxTreeAndCallCallback @ Script.js:221:21
    ? @ Script.js:235:42
    promiseReactionJob @ [native code]
-----------------------

Notes:
Inspected URL:        http://127.0.0.1:8000/media/W3C/audio/events/event_progress.html
Loading completed:    true
Frontend User Agent:  Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_1) AppleWebKit/605.1.15 (KHTML, like Gecko)

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