Go to definition on library component doesn't work

[Peter-Juhasz]

VS: 17.10.0 P1

Expectation: navigates to definition (source from symbol server or decompiled), like C# does.

2:54:00.164 [CLaSP] [null]
System.InvalidOperationException: null result is not assignable to a value type.
   at StreamJsonRpc.JsonMessageFormatter.JsonRpcResult.GetResult[T]()
   at StreamJsonRpc.JsonRpc.<InvokeCoreAsync>d__154`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.Razor.LanguageServer.ClientConnection.<SendRequestAsync>d__3`2.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.Razor.LanguageServer.AbstractRazorDelegatingEndpoint`2.<HandleRequestAsync>d__25.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.CommonLanguageServerProtocol.Framework.QueueItem`3.<StartRequestAsync>d__20.MoveNext()