Vscode: Windows: Both insider and normal version: Unable to open 'xxx': Assertion Failed: argument is undefined or null

[so2liu]

Both insider and normal version:

Insider:
Version: 1.44.0-insider (user setup)
Commit: 6cf3dd97465b2f4f666b66758991d720e003b0f4
Date: 2020-03-27T06:00:06.803Z
Electron: 7.1.11
Chrome: 78.0.3904.130
Node.js: 12.8.1
V8: 7.8.279.23-electron.0
OS: Windows_NT x64 10.0.19041

Normal version:
Version: 1.43.2 (user setup)
Commit: 0ba0ca52957102ca3527cf479571617f0de6ed50
Date: 2020-03-24T07:38:38.248Z
Electron: 7.1.11
Chrome: 78.0.3904.130
Node.js: 12.8.1
V8: 7.8.279.23-electron.0
OS: Windows_NT x64 10.0.19041

Steps to Reproduce:

1. Open any file with vscode
2. 
   Unable to open 'react-debug.md': Cannot read property 'other' of null.
Unable to open 'react-debug.md': Assertion Failed: argument is undefined or null.
3. Already tried to delete C:\Users\username\.vscode and C:\Users\username\.vscode-insiders. It doesn't work.
   

Update

1. When I deleted settings.json, vscode works again...

Does this issue occur when all extensions are disabled?: Yes

[vscodebot[bot]]

(Experimental duplicate detection)
Thanks for submitting this issue. Please also check if it is already covered by an existing one, like:

• Emmet balance not working with PHP files (#93413)
  

[QuangVM]

Hi! I have problem exactly like this. I delete setting.json but It doesn't work. There is another solution for this? Thank you!

[nchchow]

I had the same problem with Normal VSCode, but Insider Version worked for me.

Deleting settings.json from Normal Version also worked for me.

Location: $HOME/Library/Application Support/Code/User/settings.json

[ryparker]

Same issue here. This issue must not be resolved.

[kleyton-ohare]

I just had the same issue and this is how I fixed:
go to -> C:Users[USER_NAMD]AppDataRoamingCodeUsersettings.json
and look for "editor.quickSuggestions": null. Change the value to either false or true

I hope it helps you.

[sgesweinFusion]

"editor.quickSuggestions": null

I got this line added going through the Settings user interface screens to Text Editor | Suggestions, and clicking "edit in settings.json" under Quick Suggestions. Removing this line entirely also gets around this issue.

[lonesome-rider]

I just had the same issue and this is how I fixed:
go to -> C:Users[USER_NAMD]AppDataRoamingCodeUsersettings.json
and look for "editor.quickSuggestions": null. Change the value to either false or true

I hope it helps you.

This actually works.

[Sirlanri]

I just had the same issue and this is how I fixed:
go to -> C:Users[USER_NAMD]AppDataRoamingCodeUsersettings.json
and look for "editor.quickSuggestions": null. Change the value to either false or true

I hope it helps you.

Thanks, it worked:)

[McMacaron]

Why this issue is closed. I have spent with solving this issue whole evening. It is a bug

[nishchal215]

I just had the same issue and this is how I fixed:
go to -> C:Users[USER_NAMD]AppDataRoamingCodeUsersettings.json
and look for "editor.quickSuggestions": null. Change the value to either false or true
I hope it helps you.

Thanks, it worked:)

I just had the same issue and this is how I fixed:
go to -> C:Users[USER_NAMD]AppDataRoamingCodeUsersettings.json
and look for "editor.quickSuggestions": null. Change the value to either false or true

I hope it helps you.

Thanks it worked :)
And for ubuntu users to edit settings.json go to this path: $HOME/.config/Code/User/settings.json.

You can check this website: https://supunkavinda.blog/vscode-editing-settings-json

[MaxwellHarper]

Having the same problem: cannot open any files in editor. Maybe an extension corrupted something. I have uninstalled and reinstalled multiple times and I keep getting the message below when I try to open - for example - an html file.

"Assertion Failed: argument is undefined or null."