⚠️ instance variable @pid not initialized

Author: amatsuda

lib/spring/application_manager.rb

@@ -7,6 +7,7 @@ def initialize(app_env, spring_env)
       @spring_env = spring_env
       @mutex      = Mutex.new
       @state      = :running
+      @pid        = nil
     end
 
     def log(message)