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RESOLVED FIXED
224651
Web Inspector: Uncaught Exception: null is not an object (evaluating 'this._listeners.get')
https://bugs.webkit.org/show_bug.cgi?id=224651
Summary
Web Inspector: Uncaught Exception: null is not an object (evaluating 'this._l...
Devin Rousso
Reported
2021-04-15 23:41:19 PDT
# STEPS TO REPRODUCE 1. inspect <
http://acko.net
> 2. take a single-frame canvas recording Uncaught Exceptions: ----------------------- - null is not an object (evaluating 'this._listeners.get') (at Object.js:83:52) removeEventListener @ Object.js:83:52 ondetach @ ShaderProgramTreeElement.js:66:55 _detach @ TreeElement.js:294:26 removeChildren @ TreeOutline.js:382:26 removeChildren @ FolderizedTreeElement.js:74:29 onpopulate @ CanvasTreeElement.js:75:28 expand @ TreeElement.js:412:28 reveal @ TreeElement.js:488:39 revealAndSelect @ TreeElement.js:551:20 _revealAndSelectRepresentedObject @ ContentBrowserTabContentView.js:307:40 _contentBrowserCurrentContentViewDidChange @ ContentBrowserTabContentView.js:289:47 dispatch @ Object.js:129:35 dispatchEventToListeners @ Object.js:137:17 _currentContentViewDidChange @ ContentBrowser.js:540:38 dispatch @ Object.js:129:35 dispatchEventToListeners @ Object.js:137:17 showBackForwardEntryForIndex @ ContentViewContainer.js:164:38 showContentView @ ContentViewContainer.js:141:42 showRepresentedObject @ ContentBrowserTabContentView.js:218:64 showRepresentedObject @ GraphicsTabContentView.js:108:36 _addRecording @ GraphicsTabContentView.js:262:39 _handleRecordingSavedOrStopped @ GraphicsTabContentView.js:309:27 dispatch @ Object.js:129:35 dispatchEventToListeners @ Object.js:145:21 recordingFinished @ Canvas.js:427:38 recordingFinished @ CanvasManager.js:232:33 recordingFinished @ CanvasObserver.js:62:43 _dispatchEvent @ Connection.js:210:26 dispatch @ Connection.js:79:32 dispatchMessageFromTarget @ TargetManager.js:176:39 dispatchMessageFromTarget @ TargetObserver.js:47:51 _dispatchEvent @ Connection.js:210:26 dispatch @ Connection.js:79:32 dispatch @ InspectorBackend.js:232:52 ? @ MessageDispatcher.js:42:34 Additional Details: cause --> An uncaught exception was thrown while handling event: Canvas.recordingFinished ----------------------- Notes: Inspected URL:
http://acko.net/
Loading completed: true Frontend User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Dispatch Source: Protocol Event Protocol Event: {"method":"Canvas.recordingFinished","params":{"canvasId":"canvas:0.6","recording":{"version":1,"type":"canvas-webgl","initialState":{"attributes":{"width":1068,"height":1228},"parameters":[{"alpha":false,"depth":true,"stencil":false,"antialias":true,"premultipliedAlpha":true,"preserveDrawingBuffer":false,"failIfMajorPerformanceCaveat":false}],"content":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAABCwAAATMCAYAAABMVhYSAAAAAXNSR0IArs4c6QAAAERlWElmTU0AKgAAAAgAAYdpAAQAAAABAAAAGgAAAAAAA6ABAAMAAAABA…
Attachments
Patch
(11.44 KB, patch)
2021-04-15 23:52 PDT
,
Devin Rousso
no flags
Details
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proposed patch, testcase, etc.
Devin Rousso
Comment 1
2021-04-15 23:52:42 PDT
Created
attachment 426189
[details]
Patch
Blaze Burg
Comment 2
2021-04-16 09:37:03 PDT
Comment on
attachment 426189
[details]
Patch r=me Sad to be covering up this problem. We need to prioritize fixing the followup, since we now know what the design issue is.
Devin Rousso
Comment 3
2021-04-16 10:23:08 PDT
Comment on
attachment 426189
[details]
Patch (In reply to BJ Burg from
comment #2
)
> Sad to be covering up this problem. We need to prioritize fixing the followup, since we now know what the design issue is.
Yeah I agree :( I remember making a decision not to add these early-return in
r269359
because my thought was "this should never happen as we'd consider it an error", but since then I've seen it be an issue a handful of times, so I'd rather not have that happen to actual developers.
EWS
Comment 4
2021-04-16 11:07:30 PDT
Committed
r276146
(
236639@main
): <
https://commits.webkit.org/236639@main
> All reviewed patches have been landed. Closing bug and clearing flags on
attachment 426189
[details]
.
Radar WebKit Bug Importer
Comment 5
2021-04-24 15:09:22 PDT
<
rdar://problem/77110123
>
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