vscode: Got `Handler already set!` error when trying to undo in the editor

I just got the follow error when trying to undo – and it keeps happening every time I try to undo. Had to restart vscode to fix it.

This is what I see in the console:

ERR Handler already set!: Error: Handler already set!
    at o.setHandler (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:1674:15623)
    at d.registerListeners (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:1676:39804)
    at new d (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:1676:39602)
    at p._createInstance (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:625:1371)
    at p.createInstance (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:625:790)
    at new Y (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:2314:27281)
    at p._createInstance (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:625:1371)
    at vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:625:3551
    at P._executor (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:68:18543)
    at P.get value [as value] (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:68:18736)
    at Object.get (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:625:3652)
    at Tn.get isMultiSessionView [as isMultiSessionView] (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:2322:3179)
    at new Tn (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:2314:66465)
    at p._createInstance (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:625:1371)
    at p.createInstance (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:625:790)
    at P.createView (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:2558:35572)
    at P.onDidAddViewDescriptors (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:2558:36996)
    at vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:2558:32913
    at o.fire (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:60:1835)
    at h.triggerOnDidAddVisibleViewDescriptors (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:2325:9908)
    at h.onDidChangeContext (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:2325:14055)
    at vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:2325:6764
    at o.fire (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:60:1835)
    at vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:58:59092
    at v.fire (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:60:1835)
    at v.fire (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:60:2784)
    at r.setContext (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:634:120752)
    at n.set (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:634:119041)
    at new d (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:1676:39757)
    at p._createInstance (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:625:1371)
    at p.createInstance (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:625:790)
    at new Y (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:2314:27281)
    at p._createInstance (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:625:1371)
    at vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:625:3551
    at P._executor (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:68:18543)
    at P.get value [as value] (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:68:18736)
    at Object.get (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:625:3652)
    at D.registerListeners (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:2314:50275)
    at new D (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:2314:50190)
    at p._createInstance (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:625:1371)
    at p.createInstance (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:625:790)
    at b.safeCreateInstance (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:1715:6069)
    at b.doInstantiateByPhase (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:1715:5856)
    at vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:1715:5698
contributions.ts:123
Unable to instantiate workbench contribution D. Error: Handler already set!
    at o.setHandler (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:1674)
    at d.registerListeners (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:1676)
    at new d (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:1676)
    at p._createInstance (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:625)
    at p.createInstance (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:625)
    at new Y (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:2314)
    at p._createInstance (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:625)
    at vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:625
    at P._executor (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:68)
    at P.get value [as value] (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:68)
    at Object.get (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:625)
    at Tn.get isMultiSessionView [as isMultiSessionView] (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:2322)
    at new Tn (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:2314)
    at p._createInstance (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:625)
    at p.createInstance (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:625)
    at P.createView (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:2558)
    at P.onDidAddViewDescriptors (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:2558)
    at vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:2558
    at o.fire (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:60)
    at h.triggerOnDidAddVisibleViewDescriptors (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:2325)
    at h.onDidChangeContext (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:2325)
    at vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:2325
    at o.fire (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:60)
    at vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:58
    at v.fire (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:60)
    at v.fire (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:60)
    at r.setContext (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:634)
    at n.set (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:634)
    at new d (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:1676)
    at p._createInstance (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:625)
    at p.createInstance (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:625)
    at new Y (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:2314)
    at p._createInstance (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:625)
    at vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:625
    at P._executor (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:68)
    at P.get value [as value] (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:68)
    at Object.get (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:625)
    at D.registerListeners (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:2314)
    at new D (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:2314)
    at p._createInstance (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:625)
    at p.createInstance (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:625)
    at b.safeCreateInstance (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:1715)
    at b.doInstantiateByPhase (vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:1715)
    at vscode-file://vscode-app/c:/Users/Eric/AppData/Local/Programs/Microsoft%20VS%20Code%20Insiders/resources/app/out/vs/workbench/workbench.desktop.main.js:1715
safeCreateInstance @ contributions.ts:123

About this issue

Original URL
State: closed
Created 3 years ago
Reactions: 16
Comments: 22 (11 by maintainers)

Commits related to this issue

fixes #126339 — committed to microsoft/vscode by isidorn 3 years ago
fixes #126339 third time's the charm — committed to microsoft/vscode by isidorn 3 years ago

Most upvoted comments

I started getting this message with v1.57.0 when trying to run a Vue project. Long story short: I usually have my DEBUG CONSOLE window docked inside to the right of my TERMINAL (powershell), and upon opening VSCode it wouldn’t be visible and I’d get this message after building successfully and trying to launch. The work-around is to close VSCode, navigate to folder %USERPROFILE%\AppData\Roaming\Code\User\workspaceStorage and delete the contents (notably state.vscdb) and then restart VSCode. The DEBUG CONSOLE then shows itself again and all is fine unless I dock it again and close VSCode and there is a good chance of it happening again next time VSCode is opened. I have stopped docking the window inside the terminal and it hasn’t happened since.

+29

avenmore on Jun 16, 2021

Next release. Next week.

isidorn on Jul 1, 2021

restart vscode for me as emergency plan.

AngusWG on Jun 15, 2021

I started getting this message with v1.57.0 when trying to run a Vue project. Long story short: I usually have my DEBUG CONSOLE window docked inside to the right of my TERMINAL (powershell), and upon opening VSCode it wouldn’t be visible and I’d get this message after building successfully and trying to launch. The work-around is to close VSCode, navigate to folder %USERPROFILE%\AppData\Roaming\Code\User\workspaceStorage and delete the contents (notably state.vscdb) and then restart VSCode. The DEBUG CONSOLE then shows itself again and all is fine unless I dock it again and close VSCode and there is a good chance of it happening again next time VSCode is opened. I have stopped docking the window inside the terminal and it hasn’t happened since.

Yes, this is the case with me as well. I had arranged Problems, Output, Terminal, and Debug Console and build output all in one tab in split view. After setting this, if the workspace is reloaded, the issue occurs. After resetting the view, the issue gets resolved.

manishbhalshankar on Jun 18, 2021