diff --git a/webui/wisp-multiuser-add.php b/webui/wisp-multiuser-add.php
index edef6174a4fde30c24789a8abfb4d2b2df666178..b98e93686b0275e11e996c988565abb6b872252e 100644
--- a/webui/wisp-multiuser-add.php
+++ b/webui/wisp-multiuser-add.php
@@ -77,7 +77,7 @@ if (!isset($_POST['frmaction'])) {
 
 }
 
-if ($_POST['frmaction'] == "insert") {
+if (isset($_POST['frmaction']) && $_POST['frmaction'] == "insert") {
 
 ?>