diff --git a/htdocs/expensereport/class/expensereport.class.php b/htdocs/expensereport/class/expensereport.class.php
index b2d6f052a2a..5b138fd3b01 100644
--- a/htdocs/expensereport/class/expensereport.class.php
+++ b/htdocs/expensereport/class/expensereport.class.php
@@ -1525,8 +1525,8 @@ class ExpenseReport extends CommonObject
         }
         else
         {
-            print $langs->trans("Error")." ".$langs->trans("Error_EXPENSEREPORT_ADDON_NotDefined");
-            return "";
+            setEventMessages($langs->trans("ErrorFieldRequired", $langs->transnoentitiesnoconv("Error_EXPENSEREPORT_ADDON_NotDefined")), null, 'errors');
+            $errors++;
         }
     }