diff --git a/src/Server/Manager.php b/src/Server/Manager.php
index 80dcf68..67a63c2 100644
--- a/src/Server/Manager.php
+++ b/src/Server/Manager.php
@@ -99,7 +99,9 @@ public function signalHandler($signal)
             case SIGUSR2:
             case SIGTERM:
                 $this->exit = true;
-                $this->client->close(true);
+                if ($this->client->isConnected()) {
+                    $this->client->close(true);
+                }
                 file_put_contents(Configure::getPosFile(), $pidFileContent);
                 exit(0);
         }