Document is null when it was required for textDocument/documentSymbol

[advgiraffe]

Type: Bug

Issue Description

Error pops up "Request textDocument/definition failed." from C# extension

Steps to Reproduce

It just happens in the background. I assume an issue with some recent code change - like a csproj file? It just happens from time to time.

Expected Behavior

Don't raise the error because you handle whatever condtion this is

Actual Behavior

Error toast as described above.

Extension version: 2.130.5
VS Code version: Code 1.116.0 (560a9dba96f961efea7b1612916f89e5d5d4d679, 2026-04-15T00:28:13Z)
OS version: Windows_NT x64 10.0.26200
Modes:

Logs

C# log

Details

2026-04-19 15:41:59.626 [info] Locating .NET runtime version 10.0.5
2026-04-19 15:42:01.110 [info] Dotnet path: c:\Users\eriks\AppData\Roaming\Code\User\globalStorage\ms-dotnettools.vscode-dotnet-runtime\.dotnet\10.0.5~x64~aspnetcore\dotnet.exe
2026-04-19 15:42:01.110 [info] Activating C# + C# Dev Kit...
2026-04-19 15:42:01.356 [info] info: Program[0]
2026-04-19 15:42:01.356 [info]       Server started with process ID 41220
2026-04-19 15:42:02.930 [info] [Program] Language server initialized
2026-04-19 15:42:02.931 [info] [Program] Monitoring client process 33904 for exit
2026-04-19 15:42:03.719 [error] [textDocument/documentSymbol] [LSP] System.ArgumentNullException: Value cannot be null. (Parameter 'Document is null when it was required for textDocument/documentSymbol')
   at Microsoft.CodeAnalysis.LanguageServer.Handler.RequestContext.GetRequiredDocument() in /_/src/LanguageServer/Protocol/Handler/RequestContext.cs:line 211
   at Microsoft.CodeAnalysis.LanguageServer.Handler.DocumentSymbolsHandler.HandleRequestAsync(RoslynDocumentSymbolParams request, RequestContext context, CancellationToken cancellationToken) in /_/src/LanguageServer/Protocol/Handler/Symbols/DocumentSymbolsHandler.cs:line 35
   at Microsoft.CommonLanguageServerProtocol.Framework.QueueItem`1.StartRequestAsync[TRequest,TResponse](TRequest request, TRequestContext context, IMethodHandler handler, String language, CancellationToken cancellationToken) in /_/src/LanguageServer/Microsoft.CommonLanguageServerProtocol.Framework/QueueItem.cs:line 192
2026-04-19 15:42:03.719 [error] [textDocument/documentSymbol] [LSP] System.ArgumentNullException: Value cannot be null. (Parameter 'Document is null when it was required for textDocument/documentSymbol')
   at Microsoft.CodeAnalysis.LanguageServer.Handler.RequestContext.GetRequiredDocument() in /_/src/LanguageServer/Protocol/Handler/RequestContext.cs:line 211
   at Microsoft.CodeAnalysis.LanguageServer.Handler.DocumentSymbolsHandler.HandleRequestAsync(RoslynDocumentSymbolParams request, RequestContext context, CancellationToken cancellationToken) in /_/src/LanguageServer/Protocol/Handler/Symbols/DocumentSymbolsHandler.cs:line 35
   at Microsoft.CommonLanguageServerProtocol.Framework.QueueItem`1.StartRequestAsync[TRequest,TResponse](TRequest request, TRequestContext context, IMethodHandler handler, String language, CancellationToken cancellationToken) in /_/src/LanguageServer/Microsoft.CommonLanguageServerProtocol.Framework/QueueItem.cs:line 192
2026-04-19 15:42:03.727 [error] Request textDocument/documentSymbol failed.
  Message: Value cannot be null. (Parameter 'Document is null when it was required for textDocument/documentSymbol')
  Code: -32000 
[object Object]
2026-04-19 15:42:03.729 [error] Request textDocument/documentSymbol failed.
  Message: Value cannot be null. (Parameter 'Document is null when it was required for textDocument/documentSymbol')
  Code: -32000 
[object Object]
2026-04-19 15:42:06.516 [info] [textDocument/semanticTokens/range] [Microsoft.CodeAnalysis.MSBuild.BuildHostProcessManager] .NET BuildHost started from c:\Users\eriks\.vscode\extensions\ms-dotnettools.csharp-2.130.5-win32-x64\.roslyn\Microsoft.CodeAnalysis.LanguageServer.exe reloading to start from C:\Program Files\dotnet\dotnet.exe to match necessary SDK location.
2026-04-19 15:42:06.550 [warning] [textDocument/semanticTokens/range] [LanguageServerProjectLoader] Project C:\Users\eriks\AppData\Local\Temp\roslyn-canonical-misc\1883e35b-b3b9-41c5-a114-4fbaa1275f59\Canonical.csproj has unresolved dependencies
2026-04-19 15:42:06.971 [info] [textDocument/semanticTokens/range] [LanguageServerProjectLoader] Successfully completed load of C:\Users\eriks\AppData\Local\Temp\roslyn-canonical-misc\1883e35b-b3b9-41c5-a114-4fbaa1275f59\Canonical.cs
2026-04-19 15:42:07.075 [info] [textDocument/semanticTokens/range] [LanguageServerProjectLoader] Restoring Canonical.cs: Running dotnet restore on C:\Users\eriks\AppData\Local\Temp\roslyn-canonical-misc\1883e35b-b3b9-41c5-a114-4fbaa1275f59\Canonical.cs
2026-04-19 15:42:07.080 [info] [textDocument/semanticTokens/range] [Microsoft.CodeAnalysis.LanguageServer.DotnetCliHelper] Using dotnet executable configured on the PATH
2026-04-19 15:42:08.143 [info] [textDocument/semanticTokens/range] [LanguageServerProjectLoader] Restoring Canonical.cs:   Determining projects to restore...
2026-04-19 15:42:08.612 [info] [serviceBroker/connect] [WorkspaceProjectFactoryService] Project D:\source\TradeTrack2\src\PortfolioAnalyzer.Analysis\PortfolioAnalyzer.Analysis.csproj loaded by C# Dev Kit
2026-04-19 15:42:08.636 [info] [serviceBroker/connect] [WorkspaceProjectFactoryService] Project D:\source\TradeTrack2\src\PortfolioAnalyzer.QuoteService\PortfolioAnalyzer.QuoteService.csproj loaded by C# Dev Kit
2026-04-19 15:42:08.640 [info] [serviceBroker/connect] [WorkspaceProjectFactoryService] Project D:\source\TradeTrack2\tests\PortfolioAnalyzer.Analysis.Tests\PortfolioAnalyzer.Analysis.Tests.csproj loaded by C# Dev Kit
2026-04-19 15:42:08.644 [info] [serviceBroker/connect] [WorkspaceProjectFactoryService] Project D:\source\TradeTrack2\src\PortfolioAnalyzer.Web\PortfolioAnalyzer.Web.csproj loaded by C# Dev Kit
2026-04-19 15:42:08.646 [info] [serviceBroker/connect] [WorkspaceProjectFactoryService] Project D:\source\TradeTrack2\tests\PortfolioAnalyzer.Domain.Tests\PortfolioAnalyzer.Domain.Tests.csproj loaded by C# Dev Kit
2026-04-19 15:42:08.650 [info] [serviceBroker/connect] [WorkspaceProjectFactoryService] Project D:\source\TradeTrack2\tests\PortfolioAnalyzer.QuoteService.Tests\PortfolioAnalyzer.QuoteService.Tests.csproj loaded by C# Dev Kit
2026-04-19 15:42:08.652 [info] [serviceBroker/connect] [WorkspaceProjectFactoryService] Project D:\source\TradeTrack2\src\PortfolioAnalyzer.Infrastructure\PortfolioAnalyzer.Infrastructure.csproj loaded by C# Dev Kit
2026-04-19 15:42:08.655 [info] [serviceBroker/connect] [WorkspaceProjectFactoryService] Project D:\source\TradeTrack2\src\PortfolioAnalyzer.Domain\PortfolioAnalyzer.Domain.csproj loaded by C# Dev Kit
2026-04-19 15:42:08.656 [info] [serviceBroker/connect] [WorkspaceProjectFactoryService] Project D:\source\TradeTrack2\tests\PortfolioAnalyzer.Infrastructure.Tests\PortfolioAnalyzer.Infrastructure.Tests.csproj loaded by C# Dev Kit
2026-04-19 15:42:08.659 [info] [serviceBroker/connect] [WorkspaceProjectFactoryService] Project D:\source\TradeTrack2\tests\PortfolioAnalyzer.Application.Tests\PortfolioAnalyzer.Application.Tests.csproj loaded by C# Dev Kit
2026-04-19 15:42:08.662 [info] [serviceBroker/connect] [WorkspaceProjectFactoryService] Project D:\source\TradeTrack2\src\PortfolioAnalyzer.Application\PortfolioAnalyzer.Application.csproj loaded by C# Dev Kit
2026-04-19 15:42:08.665 [info] [serviceBroker/connect] [WorkspaceProjectFactoryService] Project D:\source\TradeTrack2\tests\PortfolioAnalyzer.Integration.Tests\PortfolioAnalyzer.Integration.Tests.csproj loaded by C# Dev Kit
2026-04-19 15:42:09.105 [info] [textDocument/semanticTokens/range] [LanguageServerProjectLoader] Restoring Canonical.cs:   Restored C:\Users\eriks\AppData\Local\Temp\roslyn-canonical-misc\1883e35b-b3b9-41c5-a114-4fbaa1275f59\Canonical.csproj (in 610 ms).
2026-04-19 15:42:09.183 [info] [textDocument/semanticTokens/range] [LanguageServerProjectLoader] Restore complete
2026-04-19 15:42:09.184 [info] [textDocument/semanticTokens/range] [LanguageServerProjectLoader] Completed (re)load of all projects in 00:00:04.5303058
2026-04-19 16:02:36.569 [error] [textDocument/definition] [LSP] System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values. (Parameter 'position')
   at Microsoft.CodeAnalysis.Text.CompositeText.CompositeTextLineInfo.IndexOf(Int32 position) in /_/src/Compilers/Core/Portable/Text/CompositeText.cs:line 475
   at Microsoft.CodeAnalysis.Text.TextLineCollection.GetLineFromPosition(Int32 position) in /_/src/Compilers/Core/Portable/Text/TextLineCollection.cs:line 40
   at Microsoft.CodeAnalysis.Text.TextLineCollection.GetLinePosition(Int32 position) in /_/src/Compilers/Core/Portable/Text/TextLineCollection.cs:line 48
   at Microsoft.CodeAnalysis.LanguageServer.ProtocolConversions.TextSpanToRange(TextSpan textSpan, SourceText text) in /_/src/LanguageServer/Protocol/Extensions/ProtocolConversions.cs:line 381
   at Microsoft.CodeAnalysis.LanguageServer.ProtocolConversions.<TextSpanToLocationAsync>g__ConvertTextSpanWithTextToLocation|34_1(TextSpan span, SourceText text, DocumentUri documentUri) in /_/src/LanguageServer/Protocol/Extensions/ProtocolConversions.cs:line 605
   at Microsoft.CodeAnalysis.LanguageServer.ProtocolConversions.<TextSpanToLocationAsync>g__ConvertTextSpanToLocationAsync|34_0(TextDocument document, TextSpan span, Boolean isStale, CancellationToken cancellationToken) in /_/src/LanguageServer/Protocol/Extensions/ProtocolConversions.cs:line 600
   at Microsoft.CodeAnalysis.LanguageServer.ProtocolConversions.TextSpanToLocationAsync(TextDocument document, TextSpan textSpan, Boolean isStale, Nullable`1 context, CancellationToken cancellationToken) in /_/src/LanguageServer/Protocol/Extensions/ProtocolConversions.cs:line 579
   at Microsoft.CodeAnalysis.LanguageServer.Handler.AbstractGoToDefinitionHandler.GetDefinitionsAsync(IGlobalOptionService globalOptions, IMetadataAsSourceFileService metadataAsSourceFileService, Workspace workspace, Document document, Boolean forSymbolType, LinePosition linePosition, CancellationToken cancellationToken) in /_/src/LanguageServer/Protocol/Handler/Definitions/AbstractGoToDefinitionHandler.cs:line 67
   at Microsoft.CodeAnalysis.LanguageServer.Handler.AbstractGoToDefinitionHandler.GetDefinitionAsync(TextDocumentPositionParams request, Boolean forSymbolType, RequestContext context, CancellationToken cancellationToken) in /_/src/LanguageServer/Protocol/Handler/Definitions/AbstractGoToDefinitionHandler.cs:line 47
   at Microsoft.CommonLanguageServerProtocol.Framework.QueueItem`1.StartRequestAsync[TRequest,TResponse](TRequest request, TRequestContext context, IMethodHandler handler, String language, CancellationToken cancellationToken)
2026-04-19 16:02:36.570 [error] Request textDocument/definition failed.
  Message: Specified argument was out of the range of valid values. (Parameter 'position')
  Code: -32000 
[object Object]
2026-04-19 16:02:36.713 [error] [textDocument/definition] [LSP] System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values. (Parameter 'position')
   at Microsoft.CodeAnalysis.Text.CompositeText.CompositeTextLineInfo.IndexOf(Int32 position) in /_/src/Compilers/Core/Portable/Text/CompositeText.cs:line 475
   at Microsoft.CodeAnalysis.Text.TextLineCollection.GetLineFromPosition(Int32 position) in /_/src/Compilers/Core/Portable/Text/TextLineCollection.cs:line 40
   at Microsoft.CodeAnalysis.Text.TextLineCollection.GetLinePosition(Int32 position) in /_/src/Compilers/Core/Portable/Text/TextLineCollection.cs:line 48
   at Microsoft.CodeAnalysis.LanguageServer.ProtocolConversions.TextSpanToRange(TextSpan textSpan, SourceText text) in /_/src/LanguageServer/Protocol/Extensions/ProtocolConversions.cs:line 381
   at Microsoft.CodeAnalysis.LanguageServer.ProtocolConversions.<TextSpanToLocationAsync>g__ConvertTextSpanWithTextToLocation|34_1(TextSpan span, SourceText text, DocumentUri documentUri) in /_/src/LanguageServer/Protocol/Extensions/ProtocolConversions.cs:line 605
   at Microsoft.CodeAnalysis.LanguageServer.ProtocolConversions.<TextSpanToLocationAsync>g__ConvertTextSpanToLocationAsync|34_0(TextDocument document, TextSpan span, Boolean isStale, CancellationToken cancellationToken) in /_/src/LanguageServer/Protocol/Extensions/ProtocolConversions.cs:line 600
   at Microsoft.CodeAnalysis.LanguageServer.ProtocolConversions.TextSpanToLocationAsync(TextDocument document, TextSpan textSpan, Boolean isStale, Nullable`1 context, CancellationToken cancellationToken) in /_/src/LanguageServer/Protocol/Extensions/ProtocolConversions.cs:line 579
   at Microsoft.CodeAnalysis.LanguageServer.Handler.AbstractGoToDefinitionHandler.GetDefinitionsAsync(IGlobalOptionService globalOptions, IMetadataAsSourceFileService metadataAsSourceFileService, Workspace workspace, Document document, Boolean forSymbolType, LinePosition linePosition, CancellationToken cancellationToken) in /_/src/LanguageServer/Protocol/Handler/Definitions/AbstractGoToDefinitionHandler.cs:line 67
   at Microsoft.CodeAnalysis.LanguageServer.Handler.AbstractGoToDefinitionHandler.GetDefinitionAsync(TextDocumentPositionParams request, Boolean forSymbolType, RequestContext context, CancellationToken cancellationToken) in /_/src/LanguageServer/Protocol/Handler/Definitions/AbstractGoToDefinitionHandler.cs:line 47
   at Microsoft.CommonLanguageServerProtocol.Framework.QueueItem`1.StartRequestAsync[TRequest,TResponse](TRequest request, TRequestContext context, IMethodHandler handler, String language, CancellationToken cancellationToken)
2026-04-19 16:02:36.714 [error] Request textDocument/definition failed.
  Message: Specified argument was out of the range of valid values. (Parameter 'position')
  Code: -32000 
[object Object]

C# LSP Trace Logs log

Details

Environment Information

VSCode version: 1.116.0
C# Extension: 2.130.5
Using OmniSharp: false

Dotnet Information

Host:
Version: 10.0.5
Architecture: x64
Commit: a612c2a105
RID: win-x64

.NET SDKs installed:
No SDKs were found.

.NET runtimes installed:
Microsoft.AspNetCore.App 10.0.5 [c:\Users\eriks\AppData\Roaming\Code\User\globalStorage\ms-dotnettools.vscode-dotnet-runtime.dotnet\10.0.5x64aspnetcore\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 10.0.5 [c:\Users\eriks\AppData\Roaming\Code\User\globalStorage\ms-dotnettools.vscode-dotnet-runtime.dotnet\10.0.5x64aspnetcore\shared\Microsoft.NETCore.App]

Other architectures found:
x86 [C:\Program Files (x86)\dotnet]
registered at [HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\x86\InstallLocation]

Environment variables:
DOTNET_CLI_UI_LANGUAGE [en-US]
DOTNET_MULTILEVEL_LOOKUP [0]
DOTNET_NOLOGO [true]

global.json file:
Not found

Learn more:
https://aka.ms/dotnet/info

Download .NET:
https://aka.ms/dotnet/download

Visual Studio Code Extensions

Extension	Author	Version	Folder Name
claude-code	Anthropic	2.1.114	anthropic.claude-code-2.1.114-win32-x64
cmake	twxs	0.0.17	twxs.cmake-0.0.17
cpptools	ms-vscode	1.31.4	ms-vscode.cpptools-1.31.4-win32-x64
csdevkit	ms-dotnettools	3.10.14	ms-dotnettools.csdevkit-3.10.14-win32-x64
csharp	ms-dotnettools	2.130.5	ms-dotnettools.csharp-2.130.5-win32-x64
debugpy	ms-python	2025.18.0	ms-python.debugpy-2025.18.0-win32-x64
jupyter-keymap	ms-toolsai	1.1.2	ms-toolsai.jupyter-keymap-1.1.2
pdf	tomoki1207	1.2.2	tomoki1207.pdf-1.2.2
plantuml	jebbs	2.18.1	jebbs.plantuml-2.18.1
platformio-ide	platformio	3.3.4	platformio.platformio-ide-3.3.4-win32-x64
powershell	ms-vscode	2025.4.0	ms-vscode.powershell-2025.4.0
python	ms-python	2026.4.0	ms-python.python-2026.4.0-win32-x64
rainbow-csv	mechatroner	3.24.1	mechatroner.rainbow-csv-3.24.1
remote-wsl	ms-vscode-remote	0.104.3	ms-vscode-remote.remote-wsl-0.104.3
teleplot	alexnesnes	1.1.4	alexnesnes.teleplot-1.1.4
vscode-containers	ms-azuretools	2.4.1	ms-azuretools.vscode-containers-2.4.1
vscode-dotnet-runtime	ms-dotnettools	3.0.0	ms-dotnettools.vscode-dotnet-runtime-3.0.0
vscode-icons	vscode-icons-team	12.18.0	vscode-icons-team.vscode-icons-12.18.0
vscode-pull-request-github	GitHub	0.136.0	github.vscode-pull-request-github-0.136.0
vscode-pylance	ms-python	2026.2.1	ms-python.vscode-pylance-2026.2.1
vscode-python-envs	ms-python	1.28.0	ms-python.vscode-python-envs-1.28.0-win32-x64

C# Settings

Setting	Value
preferCSharpExtension	false
compilerDiagnosticScope	openFiles
analyzerDiagnosticScope	openFiles
enableXamlTools	true
useServerGC	true

System Info

Item	Value
CPUs	12th Gen Intel(R) Core(TM) i7-12700H (20 x 2688)
GPU Status	2d_canvas: enabled GPU0: VENDOR= 0x8086, DEVICE=0x46a6 [Intel(R) Iris(R) Xe Graphics], DRIVER_VENDOR=Intel, DRIVER_VERSION=32.0.101.6790 ACTIVE GPU1: VENDOR= 0x10de, DEVICE=0x2860 [NVIDIA GeForce RTX 4070 Laptop GPU], DRIVER_VERSION=32.0.15.9597 GPU2: VENDOR= 0x1414, DEVICE=0x008c [Microsoft Basic Render Driver], DRIVER_VERSION=10.0.26100.8246 Machine model name: Machine model version: direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok skia_graphite: disabled_off trees_in_viz: disabled_off video_decode: enabled video_encode: enabled webgl: enabled webgl2: enabled webgpu: enabled webnn: disabled_off
Load (avg)	undefined
Memory (System)	63.64GB (34.61GB free)
Process Argv	--crash-reporter-id f8f119ef-42a4-4ea4-be47-0c264931ed67
Screen Reader	no
VM	0%

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cloudbuttont:31379625
3efgi100_wstrepl:31403338
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cpptoolson-v2:31475363
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ghj88844:31492074
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client_tst_t:31495907
po_split_t:31488386
ddid_t:31478206
getcmakediagnosticson:31489824
ja75b849:31495667
nes-perm-reb-0:31490411
pro_conc_t:31492543
cp_cls_c_1082:31491634
719di409_sum_t:31495624
logging_disabled_new:31493366
j0d79568:31494311
output_3x:31496636
56dj4588:31497896

[dibarbet]

@advgiraffe thanks for the report! If you can reproduce this, it would be really helpful to try the prerelease version and record the issue using https://github.com/dotnet/vscode-csharp/blob/main/SUPPORT.md#capturing-activity-trace-logging (start the trace capture, reproduce it, then stop and send the logs).