Update ServerEventHandler.php

-When the token is incorrect, repeated connection events occur in the framework

src/ZM/Event/ServerEventHandler.php

@@ -417,6 +417,7 @@ class ServerEventHandler
             if (!$token($access_token)) {
                 $server->close($request->fd);
                 Console::warning("Unauthorized access_token: " . $access_token);
+                return;
             }
         } elseif (is_string($token)) {
             if ($access_token !== $token) {