LSP: Language server process not exit after sublime exit

I had used ruby language server solargrah config:

{
  "clients":
  {
    "solargraph":
    {
      "enabled": true,
      "command": ["solargraph", "stdio"],
      "scopes": ["source.ruby", "source.ruby.rails"],
      "languageId": "ruby",
      "syntaxes": [
        "Packages/Ruby/Ruby.sublime-syntax",
        "Packages/Rails/Ruby on Rails.sublime-syntax",
        "Packages/Rails/HTML (Rails).sublime-syntax"
      ]
    }
  }
}

But when I exit Sublime Text editor, the solargraph process not exit, so there will be many solargraph processes if I closed the Sublime and opened it again.

platform: macOS solargrah version: 0.27.1

Thanks!