diff --git a/application/controllers/Booking.php b/application/controllers/Booking.php
index 9595b93f8..45f1a3457 100755
--- a/application/controllers/Booking.php
+++ b/application/controllers/Booking.php
@@ -319,7 +319,7 @@ public function register(): void
             }
 
             if (!array_key_exists('phone_number', $customer)) {
-                $customer['address'] = '';
+                $customer['phone_number'] = '';
             }
 
             // Check appointment availability before registering it to the database.