diff --git a/Sccp_manager.class.php b/Sccp_manager.class.php
index 49796d8..3a2fd47 100644
--- a/Sccp_manager.class.php
+++ b/Sccp_manager.class.php
@@ -1122,7 +1122,7 @@ class Sccp_manager extends \FreePBX_Helpers implements \BMO {
                 }
             }
         }
-        unset($raw_settings);
+        unset($raw_settings);   // passed as reference so must unset.
         return $modelList;
     }