diff --git a/CRM/Event/Form/Registration/Register.php b/CRM/Event/Form/Registration/Register.php
index a0c57076fb36..93be1bd322a4 100644
--- a/CRM/Event/Form/Registration/Register.php
+++ b/CRM/Event/Form/Registration/Register.php
@@ -1016,6 +1016,9 @@ public static function checkRegistration($fields, $form, $isAdditional = FALSE)
    * @throws \CRM_Core_Exception
    */
   private function isSuppressPayment(): bool {
+    if (!$this->getPriceSetID()) {
+      return TRUE;
+    }
     if ($this->_allowConfirmation) {
       // They might be paying for a now-confirmed registration.
       return FALSE;