diff --git a/lib/starling/handler.rb b/lib/starling/handler.rb
index 4ab2960..1bde8ac 100644
--- a/lib/starling/handler.rb
+++ b/lib/starling/handler.rb
@@ -56,6 +56,7 @@ STAT queue_%s_age %d\r\n".freeze

     SHUTDOWN_COMMAND = /\Ashutdown\r\n/m

+    QUIT_COMMAND = /\Aquit\r\n/m

     @@next_session_id = 1

@@ -126,6 +127,9 @@ STAT queue_%s_age %d\r\n".freeze
         Runner::shutdown
       when DELETE_COMMAND
         delete $1
+      when QUIT_COMMAND
+        # ignore the command, client is closing connection.
+        return nil
       else
         logger.warn "Unknown command: #{data}."
         respond ERR_UNKNOWN_COMMAND