"Cannot read property 'toLowerCase' of null"

[Awyssa]

Hello, apologies in advance as I can see this issue has come up before, but I still have no workaround.

TypeError: Cannot read property 'toLowerCase' of null
    at Object.e.fromString (/Users/ernest/.vscode/extensions/dbaeumer.vscode-eslint-2.1.14/client/out/extension.js:1:44688)
    at R.refreshTrace (/Users/ernest/.vscode/extensions/dbaeumer.vscode-eslint-2.1.14/client/out/extension.js:1:139367)
    at R.initialize (/Users/ernest/.vscode/extensions/dbaeumer.vscode-eslint-2.1.14/client/out/extension.js:1:131626)
    at /Users/ernest/.vscode/extensions/dbaeumer.vscode-eslint-2.1.14/client/out/extension.js:1:131226
[Info  - 5:39:46 PM] ESLint server running in node v12.18.3

tried removing the "eslint.trace.server", and/or changing it, but to no avail. Did uninstall on npm and vscode, still same issue. Cannot resolve issue.

Maybe I am being very stupid and it's an obvious fix, or perhaps many others are having the same issue and we can all resolve this together. Please request more info if needed.

[dbaeumer]

@Awyssa do you have any null value in your settings (user or workspace)?

[Awyssa]

Hi Dirk, thanks for the response! 
I did indeed. My VSCode settings were setting the trace.server to null, was silly of me to not check that initially. Followed these steps to fix it, just in case anyone else ran into this.

Open settings.json in VSCode, not the one that says default settings
See if you’ve got the line 'eslint.trace.server: null'
If it is in there then remove it.

Thanks again for the response, and hope this serves anyone else some assistance.

[dbaeumer]

@Awyssa can you comment why you reopened. The issue got fixed in the LSP libraries but not imported into ESLint yet.

[dbaeumer]

See https://github.com/microsoft/vscode-languageserver-node/blob/main/jsonrpc/src/common/connection.ts#L198

[Awyssa]

@dbaeumer reopened by mistake, the issue is resolved. apologies for the confusion.

[dbaeumer]

No, I was asking if there was a reason why you reopened it.