diff --git a/src/frontend.template.php b/src/frontend.template.php
index 2bd7dcc..855b9c6 100644
--- a/src/frontend.template.php
+++ b/src/frontend.template.php
@@ -38,6 +38,9 @@ $mailIdsJoinedString = filter_var(join('|', $mailIds), FILTER_SANITIZE_SPECIAL_C