v0.20.0 works, v0.21.0 causes "Cannot get property 'get' of undefined"

[PatrickDuncan]

What version of Go, VS Code & VS Code Go extension are you using?

• Run go version to get version of Go
  • go version go1.14.3 darwin/amd64
• Run code -v or code-insiders -v to get version of VS Code or VS Code Insiders
  • Version: 1.52.1
• Check your installed extensions to get the version of the VS Code Go extension
  • 0.21.0
• Run go env to get the go development environment details
  • (Work machine)

Share the Go related settings you have added/edited

Default

Describe the bug

When I saw I get the Cannot get property 'get' of undefined, but it seems like the extension was partially doing its job still. v0.20.0 does not have the error at all.

Steps to reproduce the behavior:

1. Use v0.21.0 and save a .go file on macOS

[hyangah]

@PatrickDuncan Thanks for the report - do you mind sharing the full exception log? I guess the error message is either in the
View: Toggle Output -> Log(Extension Host) or
Developer: View Developer Tools -> Console tab

[hyangah]

Oh, nevermind. I reproduced the issue. :-(

How to reproduce: disable the language server, which will activate the default build/vet checks.

TypeError: Cannot read property 'get' of undefined
	at /Users/hakim/projects/google/vscode-go/dist/goMain.js:112401:94
	at Map.forEach (<anonymous>)
	at Object.handleDiagnosticErrors (/Users/hakim/projects/google/vscode-go/dist/goMain.js:112387:19)
	at /Users/hakim/projects/google/vscode-go/dist/goMain.js:107553:20
	at Array.forEach (<anonymous>)
	at /Users/hakim/projects/google/vscode-go/dist/goMain.js:107552:17 {stack: 'TypeError: Cannot read property 'get' of unde…cts/google/vscode-go/dist/goMain.js:107552:17', message: 'Cannot read property 'get' of undefined'}

[gopherbot]

Change https://golang.org/cl/285092 mentions this issue: src/util.ts: handle inactive languageClient

[kjbass]

I'm encountering the same issue myself -- I might be a little dense towards the end of the day, but could you clarify if there is a workaround for this currently?

EDIT: I see now, setting "go.useLanguageServer": true, solves this, if anyone else runs into it.

[hyangah]

Thanks @kjbass for sharing the workaround. That's what I'd recommend - we plan to enable the language server by default next week so this is a good time to test 😅

If enabling the language server isn't an option, please try the older version (0.20.0)
Go to the extension view (Ctrl+Shift+X or Cmd+Shift+X) -> select Go -> select the gear icon -> select "Install another version" -> choose the old version

I will try to publish the patch as soon as it is reviewed. Sorry for the inconvenience.

[shotgunwilly]

I had the same issue running on Windows 10. Went back to version v0.20.2 and is working again.

[kelleyau]

I have this problem on OSX 11.1
Go version:
go version go1.15.7 darwin/amd64

Vscode version:
1.52.1

Go extension version:
v0.21.0

I also tried adding the languageserver to my settings via the sugggested workaround and that does not work for me unfortunately:

EDIT: Thanks to @BatmanAoD I was able to get rid of the error by running "Go: Install/Update Tools" and selecting all the packages and re-installing them (CMD + SHIFT + P)

[BatmanAoD]

I had the same issue, I think. I also had other weird errors, such as:

Cannot activate the 'Go Coverage Viewer' extension because it depends on an unknown 'ms-vscode.go' extension .

After some fruitless searching (and following the troubleshooting guide), I eventually discovered that my gopls was at version 0.5.5. VSCode was unable to update the tool for me (unfortunately I can't remember the error message), but manually updating to the latest (0.6.4) seems to have fixed things.

[gopherbot]

Change https://golang.org/cl/285255 mentions this issue: [release] src/util.ts: handle inactive languageClient

[hyangah]

v0.21.1 is now released. Thank you again for reporting the issue and sharing workarounds!