[Webkit-unassigned] [Bug 199082] New: Web Inspector: Error "null is not an object (evaluating 'syntaxTree.containersOfPosition')" when setting a breakpoint

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=199082

            Bug ID: 199082
           Summary: Web Inspector: Error "null is not an object
                    (evaluating 'syntaxTree.containersOfPosition')" when
                    setting a breakpoint
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sbarati at apple.com
                CC: inspector-bugzilla-changes at group.apple.com

Created attachment 372587

  --> https://bugs.webkit.org/attachment.cgi?id=372587&action=review

test case

This is happening to me on r246642 using a debug build. Attaching html test case here. (If you use a debug build, you'll need to wait until I land https://bugs.webkit.org/show_bug.cgi?id=198775 to have the WHLSL program not crash).

Repro steps:
1. Set a breakpoint on the line: "const shaderModule = device.createShaderModule({code: shaderSource, isWHLSL: true});"
2. reload the page
3. breakpoint will hit, then shortly, inspector will hit this error

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