php warnings

diff --git a/DataObjects/Mtrack_change_audit.php b/DataObjects/Mtrack_change_audit.php
index 9741dcd..0c2faf2 100644 (file)
--- a/DataObjects/Mtrack_change_audit.php
+++ b/DataObjects/Mtrack_change_audit.php
@@ -107,8 +107,8 @@ class Pman_MTrack_DataObjects_Mtrack_change_audit extends DB_DataObject
                 return false;
             
             default:
-                $oldvalue = $this->oldvalue($change);
-                $value = $this->value($change);
+                $oldvalue = (string) $this->oldvalue($change);
+                $value = (string) $this->value($change);