diff --git a/inc/VpnClient.php b/inc/VpnClient.php
index 0377de2..c19e750 100644
--- a/inc/VpnClient.php
+++ b/inc/VpnClient.php
@@ -757,7 +757,7 @@ class VpnClient
             $escaped
         );
 
-        $out = shell_exec($sshCmd);
+        $out = (string) shell_exec($sshCmd);
         $parts = explode("---", trim($out));
 
         if (count($parts) < 2) {