diff --git a/core/Filesystem.php b/core/Filesystem.php
index 7549192a2c567826afe1f8b2a5c49885e64d8da3..c22a4d0b2106a9b809b5352f265fe307bb3bedfa 100644
--- a/core/Filesystem.php
+++ b/core/Filesystem.php
@@ -135,9 +135,8 @@ class Filesystem
 
             $output = @shell_exec($command);
             if ($output) {
-                $output = explode("\n", trim($output));
-
                 $commandFailed = (false !== strpos($output, "no file systems processed"));
+                $output = explode("\n", trim($output));
                 if (!$commandFailed
                     && count($output) > 1) {
                     // check if filesystem is NFS