[Webkit-unassigned] [Bug 174823] New: Uncaught Exception: undefined is not an object (evaluating 'this._memoryRow.value = Number.bytesToString(this._canvas.memoryCost)')

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=174823

            Bug ID: 174823
           Summary: Uncaught Exception: undefined is not an object
                    (evaluating 'this._memoryRow.value =
                    Number.bytesToString(this._canvas.memoryCost)')
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
               URL: https://www.apple.com/ipad-pro/
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bburg at apple.com
                CC: inspector-bugzilla-changes at group.apple.com

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Inspected URL:        https://www.apple.com/ipad-pro/
Loading completed:    true
Frontend User Agent:  Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13) AppleWebKit/605.1.1+ (KHTML, like Gecko)
Dispatch Source:      Protocol Event

Protocol Event:
{"method":"Canvas.canvasMemoryChanged","params":{"canvasId":"canvas:0.6","memoryCost":182400}}

Uncaught Exceptions:
 - undefined is not an object (evaluating 'this._memoryRow.value = Number.bytesToString(this._canvas.memoryCost)') (at CanvasDetailsSidebarPanel.js:287:24)
    _formatMemoryRow @ CanvasDetailsSidebarPanel.js:287:24
    _canvasMemoryChanged @ CanvasDetailsSidebarPanel.js:292:30
    dispatch @ Object.js:170:30
    dispatchEventToListeners @ Object.js:177:17
    memoryCost @ Canvas.js:119:38
    canvasMemoryChanged @ CanvasManager.js:84:15
    canvasMemoryChanged @ CanvasObserver.js:42:55
    dispatchEvent @ InspectorBackend.js:293:42
    _dispatchEvent @ Connection.js:193:32
    dispatch @ Connection.js:71:32
    dispatch @ InspectorBackend.js:152:49
    dispatchNextQueuedMessageFromBackend @ MessageDispatcher.js:42:34

Additional Details:
    cause --> An uncaught exception was thrown while handling event: Canvas.canvasMemoryChanged
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* STEPS TO REPRODUCE
1. Turn on canvas feature
2. Go to mentioned website and click around until a canvas shows up

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