Neovim LSP Error - Attempt to Index Local 'decoded' (a nil value) #2574

MiliAxe · 2023-10-10T23:00:38Z

Issue Description

I am encountering an error when using the OmniSharp Language Server Protocol (LSP) integration in Neovim. The error message I receive is as follows:

Error executing luv callback:
/usr/local/share/nvim/runtime/lua/vim/lsp/rpc.lua:366: attempt to index local 'decoded' (a nil value)
stack traceback:
        /usr/local/share/nvim/runtime/lua/vim/lsp/rpc.lua:366: in function 'handle_body'
        /usr/local/share/nvim/runtime/lua/vim/lsp/rpc.lua:666: in function 'handle_body'
        /usr/local/share/nvim/runtime/lua/vim/lsp/rpc.lua:240: in function </usr/local/share/nvim/runtime/lua/vim/lsp/rpc.lua:224>

Steps to Reproduce

Open Neovim with the OmniSharp LSP integration.
Open a C# project or file, and attempt to perform some LSP-related actions.
Observe the error message mentioned above in the LSP log.

Expected Behavior

I expect the OmniSharp LSP integration to work without errors and to correctly handle symbol detection and LSP-related requests.

Actual Behavior

The error mentioned above is encountered but normal usage of language server is achievable if the error is ignored. it appears to be related to the decoding of JSON data within the LSP integration.

System Information

Neovim Version:
NVIM v0.10.0-dev-1325+gc4f8be464
Build type: RelWithDebInfo
LuaJIT 2.1.1696795921
OmniSharp Version: 1.39.10
Operating System: Arch Linux

Log Files

LspLog:

[WARN][2023-10-11 02:21:40] ...lsp/handlers.lua:557 "OmniSharp.Extensions.LanguageServer.Server.LspServerOutputFilter: Tried to send request or notification before initialization was completed and will be sent later OutgoingNotification { Method = o#/projectdiagnosticstatus, Params = {\n \"Type\": \"background\",\n \"Status\": 0,\n \"ProjectFilePath\": \"(100%)\"\n}, TraceParent = , TraceState = } | @request='OutgoingNotification { Method = o#/projectdiagnosticstatus, Params = {\n \"Type\": \"background\",\n \"Status\": 0,\n \"ProjectFilePath\": \"(100%)\"\n}, TraceParent = , TraceState = }'" [WARN][2023-10-11 02:21:40] ...lsp/handlers.lua:557 "OmniSharp.Extensions.LanguageServer.Server.LspServerOutputFilter: Tried to send request or notification before initialization was completed and will be sent later OutgoingNotification { Method = o#/projectconfiguration, Params = {\n \"ProjectId\": \"f86d6df5-e245-49aa-9e6a-140d54063466\",\n \"SessionId\": \"1909222218\",\n \"OutputKind\": 0,\n \"ProjectCapabilities\": [\n \"GenerateDocumentationFile\",\n \"CSharp\",\n \"Managed\",\n \"ReferencesFolder\",\n \"LanguageService\",\n \"RelativePathDerivedDefaultNamespace\",\n \"AssemblyReferences\",\n \"COMReferences\",\n \"ProjectReferences\",\n \"SharedProjectReferences\",\n \"OutputGroups\",\n \"AllTargetOutputGroups\",\n \"VisualStudioWellKnownOutputGroups\",\n \"SingleFileGenerators\",\n \"DeclaredSourceItems\",\n \"UserSourceItems\",\n \"CrossPlatformExecutable\",\n \"SupportsHotReload\",\n \"Pack\"\n ],\n \"TargetFrameworks\": [\n \"net7.0\"\n ],\n \"SdkVersion\": \"58988350\",\n \"References\": [\n \"f9b57385e04dcef1\",\n \"b04d1a92c03aa393\",\n \"740a41f35e38e687\",\n \"a650b002a55ee732\",\n \"8bb25cdfa9f58d95\",\n \"ca01f9c6c9519128\",\n \"a7db6d4c13eb109a\",\n \"4787ec450370cdc\",\n \"faae3cd2329a5f23\",\n \"b136c9057d0eac41\",\n \"a4be57a67913d9f2\",\n \"c2f7e51423366080\",\n \"9221249557edf7da\",\n \"ac08b9147e6c6cc1\",\n \"fc8f31a851b2f1e\",\n \"3d1fab7a1546aa70\",\n \"75c42701c310d265\",\n \"6eac5906d797823f\",\n \"51b6b65db45d8317\",\n \"977562ede61122d1\",\n \"6f06be6c7dad3d57\",\n \"782a823a2d8cd40\",\n \"13bbf2cbcdb96469\",\n \"a8b1d9f359d7b4f\",\n \"8db448e27f0bad1b\",\n \"5faa84ffcc646d16\",\n \"3dd9e1e713ce28c1\",\n \"bc70a3688f03b546\",\n \"3e025539204a5d59\",\n \"12bec27505c61c10\",\n \"65e9cc7358ddee2e\",\n \"7df5bfe00323a6a8\",\n \"ce3f444652eead51\",\n \"feebdde9a00fe94b\",\n \"22d24df113118e04\",\n \"6a8ada60e30e6abf\",\n \"6001a9b860f7e43\",\n \"e94e5ff7b2eb39a9\",\n \"46b5412910b12f1a\",\n \"eac4975c939bd705\",\n \"a777367473e5f95c\",\n \"f67433e0978efe89\",\n \"d574426ce261f3cd\",\n \"2620772be337bacb\",\n \"ce4b86769789bfd2\",\n \"afe098e2b8eb2364\",\n \"4bca77302b767821\",\n \"b42e3bf9c2caf9d\",\n \"11d6a5981dd09f1d\",\n \"2528657f041a0f71\",\n \"1a4910e7928d2be4\",\n \"385f6cb9a1a92341\",\n \"8a6a053fd546c4b9\",\n \"4bd5d70d9487a7\",\n \"546da94a433dd46b\",\n \"c8cd67501180cdb3\",\n 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Thank you for your help in addressing this problem.

The text was updated successfully, but these errors were encountered:

MiliAxe · 2023-10-11T10:06:16Z

Edit: Using an older version like 1.39.8 Does not give such an error.

Seems like this error started appearing from 1.39.9 onward.

In v1.39.9, this error keeps being spammed. unlike v1.39.10 that goes away if ignored

kidkych · 2023-10-30T02:02:23Z

Also having the exact same issue. Any updates? I am on v1.39.10 as well

JoeRobich · 2023-10-31T20:46:26Z

Edit: Using an older version like 1.39.8 Does not give such an error.

Seems like this error started appearing from 1.39.9 onward.

In 1.39.9 we took an updated build of the csharp-language-server-protocol libraries. It is likely a regression there. Has anyone been able to determine which request is causing the error? If so, we could open an issue at https://github.com/OmniSharp/csharp-language-server-protocol/issues

StreenJiang · 2023-11-23T03:18:54Z

Still has the same issue in 1.39.10

Jonatanc05 · 2023-11-24T20:32:24Z

Exact problem here. Except I only get it on a huge and old net3.1 project and, well, could be unrelated but the LSP spams errors, starting with the using statements:

The type or namespace name 'System' could not be found (are you missing a using directive or an assembly reference?)

leblocks · 2023-11-28T12:22:27Z

Same issue in omnisharp 1.39.10 and neovim 0.9.4 on windows

teast · 2023-12-06T06:56:44Z

I too am having this problems from time to time.

I tried to do some debug printout in neovim and this is my finding (maybe someone here can make sense of them?)

in rpc.lua there is an method "create_read_loop" that has following while loop:

    while true do
      local headers, body = parse_chunk(chunk)
      if headers then
        if body == nil then
          print("BODY IS NIL IN create_read_loop");
        end
        if body == "null" then
          print("BODY is: \"null\", chunk: " .. dump(chunk));
        end
        handle_body(body)
        chunk = ''
      else
        break
      end
    end

As you can see I have added two if-cases for my debug print.

The second one is hit when this error is generated. I think the error could be cause by parse_chunk(chunk) returning the string "null" to body.

The chunk that caused "null" to be returned looked like this (note, I have redacted some part):

{
    "jsonrpc": "2.0",
    "method": "o#/projectchanged",
    "params": {
        "MsBuildProject": {
            "AssemblyName": "REDACTED",
            "Configuration": "Debug",
            "IntermediateOutputPath": "obj\\Debug\\net6.0\\",
            "IsExe": true,
            "IsUnityProject": false,
            "OutputPath": "bin\\Debug\\net6.0\\",
            "Path": "C:\\projects\\REDACTED\\tests\\REDACTED.csproj",
            "Platform": "AnyCPU",
            "ProjectGuid": "00000000-0000-0000-0000-000000000000",
            "SourceFiles": [
                " *** REDACTED *** "
            ],
            "TargetFramework": ".NETCoreApp,Version=v6.0",
            "TargetFrameworks": [
                {
                    "FriendlyName": ".NETCoreApp",
                    "Name": ".NETCoreApp",
                    "ShortName": "net6.0"
                }
            ],
            "TargetPath": "C:\\projects\\REDACTED\\tests\\REDACTED\\bin\\Debug\\net6.0\\REDACTED.dll"
        }
    }
}

KiLLeRRaT · 2024-01-09T17:08:58Z

Same issue in omnisharp 1.39.11 and neovim 0.9.5 on Arch

sajadspeed · 2024-01-18T10:32:17Z

Same here.

omas313 · 2024-01-23T05:32:48Z

Having the same issue.
System Information: OmniSharp v1.39.11, Neovim v0.9.5, Pop!_OS 22.04 LTS

Hannover1992 · 2024-01-23T14:53:36Z

Error executing vim.schedule lua callback: /opt/neovim/share/nvim/runtime/lua/vim/lsp/util.lua:1157: Cursor position outside buffer
stack traceback:
[C]: in function 'nvim_win_set_cursor'
/opt/neovim/share/nvim/runtime/lua/vim/lsp/util.lua:1157: in function 'jump_to_location'
/opt/neovim/share/nvim/runtime/lua/vim/lsp/handlers.lua:412: in function 'handler'
/opt/neovim/share/nvim/runtime/lua/vim/lsp.lua:1393: in function ''
vim/_editor.lua: in function <vim/_editor.lua:0>
Press ENTER or type command to continue

◍ omnisharp
  OmniSharp language server based on Roslyn workspaces. This version of Omnisharp requires dotnet (.NET 6.0) to be
  installed.


  installed version v1.39.11                                      
  homepage          https://github.com/OmniSharp/omnisharp-roslyn 
  languages         C#                                            
  categories        LSP                                           
  executables       omnisharp                                     

  ↓ LSP server configuration schema (press enter to collapse)
    This is a read-only overview of the settings this server accepts. Note that some settings might not apply to neovim.

Same Problem, but i am fresh in omnisharp, perhaps bad config

Kleppa · 2024-01-30T10:32:22Z

Same issue.

OmniSharp: 1.39.11
EndevourOs: 2023.08.05

NoodleBug · 2024-01-30T21:11:38Z

Can confirm still happening on v1.39.11 but not v1.39.8 for me

infinite-ram · 2024-02-02T21:39:54Z

same issue occurs on v1.39.11 using Linux.

jknopp · 2024-02-13T23:33:03Z

Same issue occurs on v1.39.11 using MacOS, NeoVim 0.9.5.

616b2f · 2024-02-14T23:02:10Z

This issue seems related: #2594

superbrobenji · 2024-02-17T20:08:52Z

can confirm still an issue

Ani-Sako · 2024-02-18T07:46:02Z

Still an issue on omnisharp 1.39.10, neovim 0.9.5 on Windows 11.

Rolling back to omnisharp 1.39.8 fixes the issue (if using Mason run :MasonInstall [email protected]).

sergiuser1 · 2024-03-04T12:07:20Z

Still an issue on omnisharp 1.39.10, neovim 0.9.5 on Windows 11.

Rolling back to omnisharp 1.39.8 fixes the issue (if using Mason run :MasonInstall [email protected]).

You need an extra v in the version:

:MasonInstall [email protected]

Green0wl · 2024-03-12T11:41:32Z

same issue. omnisharp v1.39.11. NVIM v0.9.5. 6.6.9-arch1-1.

litoj · 2024-04-09T12:43:07Z

The simplest workaround is to edit /usr/share/nvim/runtime/lua/vim/lsp/rpc.lua:383 and add not decoded to the first check of handle_body() →
if not ok or not decoded then...

VanAdcox · 2024-04-12T01:37:34Z

Still an issue omnisharp v1.39.11. NVIM v0.9.5

Rolling back becuase of this: OmniSharp/omnisharp-roslyn#2574

mrphil2105 · 2024-04-22T17:27:45Z

I have the same issue. I am also using Omnisharp v1.39.11 and Neovim v0.9.5 on Arch Linux.

sajadspeed · 2024-04-23T04:36:39Z

Does anyone want to solve this problem? It seems that everyone has this problem.

StreenJiang · 2024-04-23T04:40:44Z

Does anyone want to solve this problem? It seems that everyone has this problem.

Yes of course I want, but for me, I don't really know neovim apis, I don't know lua, and I don't have much time to dig into it for now, so what I can do is to wait for a hero to save us hahahaha

svermeulen · 2024-04-29T08:12:07Z

In my case going back to 1.39.8 didn't help, but going back to 1.38.2 did. This also fixed another issue I was having where code actions stopped working.

Information about the bug can be found here: OmniSharp/omnisharp-roslyn#2574

pluma9 · 2024-05-12T05:52:13Z

In my case going back to 1.39.8 didn't help, but going back to 1.38.2 did. This also fixed another issue I was having where code actions stopped working.

I am having this issue in 1.39.9, 1.39.8, 1.38.2 only in large codebases. The error says "No code actions". I have temporarily switched to csharp-ls.

rudiejd · 2024-05-28T22:27:55Z

I too am having this problems from time to time.

I tried to do some debug printout in neovim and this is my finding (maybe someone here can make sense of them?)

in rpc.lua there is an method "create_read_loop" that has following while loop:

    while true do
      local headers, body = parse_chunk(chunk)
      if headers then
        if body == nil then
          print("BODY IS NIL IN create_read_loop");
        end
        if body == "null" then
          print("BODY is: \"null\", chunk: " .. dump(chunk));
        end
        handle_body(body)
        chunk = ''
      else
        break
      end
    end

As you can see I have added two if-cases for my debug print.

The second one is hit when this error is generated. I think the error could be cause by parse_chunk(chunk) returning the string "null" to body.

The chunk that caused "null" to be returned looked like this (note, I have redacted some part):

{
    "jsonrpc": "2.0",
    "method": "o#/projectchanged",
    "params": {
        "MsBuildProject": {
            "AssemblyName": "REDACTED",
            "Configuration": "Debug",
            "IntermediateOutputPath": "obj\\Debug\\net6.0\\",
            "IsExe": true,
            "IsUnityProject": false,
            "OutputPath": "bin\\Debug\\net6.0\\",
            "Path": "C:\\projects\\REDACTED\\tests\\REDACTED.csproj",
            "Platform": "AnyCPU",
            "ProjectGuid": "00000000-0000-0000-0000-000000000000",
            "SourceFiles": [
                " *** REDACTED *** "
            ],
            "TargetFramework": ".NETCoreApp,Version=v6.0",
            "TargetFrameworks": [
                {
                    "FriendlyName": ".NETCoreApp",
                    "Name": ".NETCoreApp",
                    "ShortName": "net6.0"
                }
            ],
            "TargetPath": "C:\\projects\\REDACTED\\tests\\REDACTED\\bin\\Debug\\net6.0\\REDACTED.dll"
        }
    }
}

I'm not able to reproduce this on the current nightly build of neovim. Here's the script I used

local body = 
[[
{
    "jsonrpc": "2.0",
    "method": "o#/projectchanged",
    "params": {
        "MsBuildProject": {
            "AssemblyName": "REDACTED",
            "Configuration": "Debug",
            "IntermediateOutputPath": "obj\\Debug\\net6.0\\",
            "IsExe": true,
            "IsUnityProject": false,
            "OutputPath": "bin\\Debug\\net6.0\\",
            "Path": "C:\\projects\\REDACTED\\tests\\REDACTED.csproj",
            "Platform": "AnyCPU",
            "ProjectGuid": "00000000-0000-0000-0000-000000000000",
            "SourceFiles": [
                " *** REDACTED *** "
            ],
            "TargetFramework": ".NETCoreApp,Version=v6.0",
            "TargetFrameworks": [
                {
                    "FriendlyName": ".NETCoreApp",
                    "Name": ".NETCoreApp",
                    "ShortName": "net6.0"
                }
            ],
            "TargetPath": "C:\\projects\\REDACTED\\tests\\REDACTED\\bin\\Debug\\net6.0\\REDACTED.dll"
        }
    }
}
]]

local ok, decoded = pcall(vim.json.decode, body, { luanil = { object = true } })

print(vim.inspect(decoded))

and that parses fine 🤔 but I still get this error when I open a project. I'll try to add some debugging code into my local neovim runtime and see what line is causing decoded = nil for me.

nagaohiroki · 2024-06-25T07:39:37Z

This issue seems to have occurred after this commit.
51c5e00

nagaohiroki · 2024-07-01T11:02:23Z

If I change 51c5e00 back to b2e64c6 in CSharpDiagnosticWorkerWithAnalyzers.cs, nvim runs smoothly and the error goes away.

Changing from AnalyzerWorkQueue to AsyncAnalyzerWorkQueue seems to cause an error in nvim.

But even after changing ac7b9b8(latest) CSharpDiagnosticWorkerWithAnalyzers.cs to b2e64c6 omnisharp-roslyn still doesn't work.

nagaohiroki · 2024-07-08T02:22:31Z

But even after changing ac7b9b8 (latest) CSharpDiagnosticWorkerWithAnalyzers.cs to b2e64c6 omnisharp-roslyn still doesn't work.

This was my build issue.
I used app.config because AutoGenerateBindingRedirects doesn't work in Visual Studio 2022.

Reverting to the latest CSharpDiagnosticWorkerWithAnalyzers.cs to b2e64c6 solved issue.

Watynecc · 2024-07-09T14:37:49Z

I also have this issue in a new console project

gab-gil · 2024-07-12T14:34:59Z

Same here, on neovim 10.0.0 and omnisharp 1.39.11. It happens randomly after I close buffers

VyshnavCJ · 2024-07-13T06:23:52Z

Having same issue when I install omnisharp 1.39.11 in Arch Linux, but my Ubuntu WSL have no problem.

Greenscreener · 2024-07-23T22:03:51Z

But even after changing ac7b9b8 (latest) CSharpDiagnosticWorkerWithAnalyzers.cs to b2e64c6 omnisharp-roslyn still doesn't work.

This was my build issue. I used app.config because AutoGenerateBindingRedirects doesn't work in Visual Studio 2022.

Reverting to the latest CSharpDiagnosticWorkerWithAnalyzers.cs to b2e64c6 solved issue.

@nagaohiroki man you are an absolute legend, this fixes it, thank you very much.

If anybody needs a quick script to build OmniSharp with the fix here it is:

git clone https://github.com/OmniSharp/omnisharp-roslyn
cd omnisharp-roslyn
git checkout b2e64c6 -- $(find . -name CSharpDiagnosticWorkerWithAnalyzers.cs)
dotnet build --configuration Release

The built OmniSharp binary will be in bin/Release/OmniSharp.Stdio.Driver/net6.0/OmniSharp (or bin/Release/OmniSharp.Http.Driver/net6.0/OmniSharp if you use the HTTP version.

jkallio · 2024-08-07T14:15:55Z

Neovim Pull Request 29196 implements a nil-check for the LSP server response. Still does not fix the underlying problem (LSP returing nil), but at least rpc.lua script should not crash when this happens

Neovim Issue 27395

Watynecc · 2024-08-22T10:50:59Z

But even after changing ac7b9b8 (latest) CSharpDiagnosticWorkerWithAnalyzers.cs to b2e64c6 omnisharp-roslyn still doesn't work.

This was my build issue. I used app.config because AutoGenerateBindingRedirects doesn't work in Visual Studio 2022.
Reverting to the latest CSharpDiagnosticWorkerWithAnalyzers.cs to b2e64c6 solved issue.

@nagaohiroki man you are an absolute legend, this fixes it, thank you very much.

If anybody needs a quick script to build OmniSharp with the fix here it is:
git clone https://github.com/OmniSharp/omnisharp-roslyn
cd omnisharp-roslyn
git checkout b2e64c6 -- $(find . -name CSharpDiagnosticWorkerWithAnalyzers.cs)
dotnet build --configuration Release
The built OmniSharp binary will be in bin/Release/OmniSharp.Stdio.Driver/net6.0/OmniSharp (or bin/Release/OmniSharp.Http.Driver/net6.0/OmniSharp if you use the HTTP version.

It works

rudiejd · 2024-08-23T22:34:09Z

neovim/neovim#29196 fixed the crash for me 🎉 thank you all for your persistence and help!

MoaidHathot · 2025-02-11T09:02:37Z

neovim/neovim#29196 fixed the crash for me 🎉 thank you all for your persistence and help!

I don't think an nvim version was released with this fix yet. We can find it in main but not in the 0.10 branches and it still reproduce for me

teast mentioned this issue Feb 8, 2024

Omnisharp Lsp server return "null" not handled in Neovim neovim/neovim#27395

Closed

zapling added a commit to zapling/dotfiles-wayland that referenced this issue Apr 18, 2024

nvim - rollback omnisharp version

8530261

Rolling back becuase of this: OmniSharp/omnisharp-roslyn#2574

andejoha added a commit to andejoha/nvim that referenced this issue Apr 30, 2024

Downgrade current version of omnisharp to avoid bug

89d4be9

Information about the bug can be found here: OmniSharp/omnisharp-roslyn#2574

lillo42 mentioned this issue Jun 24, 2024

feat(c#): add support csharp-language-server LazyVim/LazyVim#3799

Open

1 task

nagaohiroki mentioned this issue Jun 27, 2024

investigation omnisharp-roslyn on neovim nagaohiroki/dotfiles#4

Closed

8 tasks

nagaohiroki mentioned this issue Jul 17, 2024

For the same unity project, omnisharp starts much slower than vscode in nvim. #2606

Open

nagaohiroki mentioned this issue Jul 28, 2024

No LSP in a project and memory leak #2623

Open

cizra mentioned this issue Aug 6, 2024

Recent versions of OmniSharp cause LSP[bugged-ls]: Error INVALID_SERVER_MESSAGE: nil neovim/neovim#29988

Closed

Neovim LSP Error - Attempt to Index Local 'decoded' (a nil value) #2574

Neovim LSP Error - Attempt to Index Local 'decoded' (a nil value) #2574

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