Exception: Pipeline response (OmniSharp.Extensions.LanguageServer.Protocol.Models.SignatureHelp) must not be null

[ijacquez]

I'm on v1.36.1, using the release build for Linux x86_x64.

It's constantly spamming this error in Emacs. This does not seem to occur between v1.35.4. So there might have been a regression introduced in v1.36.0, as I had the same error for that version.

LSP :: Error from the Language Server: Internal Error - System.ArgumentNullException: Pipeline response (OmniSharp.Extensions.LanguageServer.Protocol.Models.SignatureHelp) must not be null
Parameter name: request
  at OmniSharp.Extensions.JsonRpc.Pipelines.ResponseMustNotBeNullProcessor`2[T,R].Process (T request, R response, System.Threading.CancellationToken cancellationToken) [0x0004a] in <56b9fd276d4f44c4b8a81f8675a48108>:0 
  at MediatR.Pipeline.RequestPostProcessorBehavior`2[TRequest,TResponse].Handle (TRequest request, System.Threading.CancellationToken cancellationToken, MediatR.RequestHandlerDelegate`1[TResponse] next) [0x000b3] in <fda3099d189a4cec81f93633ab4245b7>:0 
  at MediatR.Pipeline.RequestPreProcessorBehavior`2[TRequest,TResponse].Handle (TRequest request, System.Threading.CancellationToken cancellationToken, MediatR.RequestHandlerDelegate`1[TResponse] next) [0x0013e] in <fda3099d189a4cec81f93633ab4245b7>:0 
  at OmniSharp.Extensions.LanguageServer.Server.Pipelines.ResolveCommandPipeline`2[TRequest,TResponse].Handle (TRequest request, System.Threading.CancellationToken cancellationToken, MediatR.RequestHandlerDelegate`1[TResponse] next) [0x0006d] in <640c8a135536442dacc4e53bba69ce94>:0 
  at OmniSharp.Extensions.JsonRpc.RequestRouterBase`1[TDescriptor].<RouteRequest>g__InnerRoute|8_0 (Microsoft.Extensions.DependencyInjection.IServiceScopeFactory serviceScopeFactory, OmniSharp.Extensions.JsonRpc.Server.Request request, TDescriptor descriptor, System.Object params, System.Threading.CancellationToken token, Microsoft.Extensions.Logging.ILogger logger) [0x000f2] in <56b9fd276d4f44c4b8a81f8675a48108>:0 
  at OmniSharp.Extensions.JsonRpc.RequestRouterBase`1[TDescriptor].RouteRequest (OmniSharp.Extensions.JsonRpc.IRequestDescriptor`1[TDescriptor] descriptors, OmniSharp.Extensions.JsonRpc.Server.Request request, System.Threading.CancellationToken token) [0x005c6] in <56b9fd276d4f44c4b8a81f8675a48108>:0 
  at OmniSharp.Extensions.JsonRpc.InputHandler+<>c__DisplayClass38_0.<RouteRequest>b__5 (System.Threading.CancellationToken ct) [0x000e8] in <56b9fd276d4f44c4b8a81f8675a48108>:0  (Internal Error)

[kirill-gerasimenko]

Got the same error on similar system.

[ijacquez]

I have added a bit more info to the issue OP.

[david-driscoll]

So yeah I broke this, got a change in, will get a new release out asap.