[Webkit-unassigned] [Bug 210168] New: Web Inspector: Uncaught Exception: undefined is not an object (evaluating 'this._target.NetworkAgent.getResponseBody')

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=210168

            Bug ID: 210168
           Summary: Web Inspector: Uncaught Exception: undefined is not an
                    object (evaluating
                    'this._target.NetworkAgent.getResponseBody')
           Product: WebKit
           Version: WebKit Local Build
          Hardware: All
               URL: file:///Volumes/DATA/Build/Debug/WebInspectorUI.framew
                    ork/Resources/Main.html
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: drousso at apple.com
                CC: inspector-bugzilla-changes at group.apple.com

Uncaught Exception in Web Inspector.

Steps to Reproduce:
1. inspect any page with content that doesn't auto-format/pretty-print
2. inspect the inspector
3. set a breakpoint in the constructor of `WI.FormatterContentBuilder`
4. auto-format/pretty-print a resource

Also throws when selecting a frame 

Uncaught Exceptions:
-----------------------
 - undefined is not an object (evaluating 'this._target.NetworkAgent.getResponseBody') (at Resource.js:851:45)
    requestContentFromBackend @ Resource.js:851:45
    requestContent @ SourceCode.js:173:100
    _tryEnableCustomResponseContentViews @ ResourceClusterContentView.js:504:38
    ResourceClusterContentView @ ResourceClusterContentView.js:59:50
    createFromRepresentedObject @ ContentView.js:52:53
    contentViewForRepresentedObject @ ContentView.js:214:72
    showContentViewForRepresentedObject @ ContentBrowser.js:151:63
    showRepresentedObject @ ContentBrowserTabContentView.js:225:64
    ? @ Main.js:1427:41
    ? @ Main.js:1472:29
    ? @ Main.js:1477:22
    _handleTreeSelectionDidChange @ SourcesNavigationSidebarPanel.js:1849:42
    dispatch @ Object.js:165:30
    dispatchEventToListeners @ Object.js:172:17
    _dispatchSelectionDidChangeEvent @ TreeOutline.js:1133:38
    selectionControllerSelectionDidChange @ TreeOutline.js:805:46
    _updateSelectedItems @ SelectionController.js:392:65
    selectItem @ SelectionController.js:97:34
    selectedTreeElement @ TreeOutline.js:160:49
    selectTreeElementInternal @ TreeOutline.js:895:13
    select @ TreeElement.js:543:46
    refresh @ ThreadTreeElement.js:67:46
    _handleDebuggerCallFramesDidChange @ SourcesNavigationSidebarPanel.js:2288:32
    dispatch @ Object.js:165:30
    dispatchEventToListeners @ Object.js:172:17
    debuggerDidPause @ DebuggerManager.js:830:38
    paused @ DebuggerObserver.js:71:44
    _dispatchEvent @ Connection.js:210:26
    dispatch @ Connection.js:79:32
    dispatchMessageFromWorker @ WorkerManager.js:76:28
    dispatchMessageFromWorker @ WorkerObserver.js:42:51
    _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:219:52
    ? @ MessageDispatcher.js:42:34

Additional Details:
    cause --> An uncaught exception was thrown while handling event: Debugger.paused
-----------------------

Notes:
Inspected URL:        file:///Volumes/DATA/Build/Debug/WebInspectorUI.framework/Resources/Main.html
Loading completed:    true
Frontend User Agent:  Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_4) AppleWebKit/605.1.15 (KHTML, like Gecko)
Dispatch Source:      Protocol Event

Protocol Event:
{"method":"Debugger.paused","params":{"callFrames":[{"callFrameId":"{\"ordinal\":0,\"injectedScriptId\":1}","functionName":"FormatterContentBuilder","location":{"scriptId":"689","lineNumber":30,"columnNumber":8},"scopeChain":[{"object":{"type":"object","objectId":"{\"injectedScriptId\":1,\"id\":1}","className":"JSLexicalEnvironment","description":"JSLexicalEnvironment"},"type":"closure","name":"FormatterContentBuilder","location":{"scriptId":"689","lineNumber":29,"columnNumber":16}},{"object":{"…

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