diff --git a/CRM/Event/Form/Registration/Confirm.php b/CRM/Event/Form/Registration/Confirm.php
index d7475ca9c9e4..7da2d0455140 100644
--- a/CRM/Event/Form/Registration/Confirm.php
+++ b/CRM/Event/Form/Registration/Confirm.php
@@ -1016,21 +1016,14 @@ public static function processContribution(
       $contribParams['is_test'] = 1;
     }
 
-    $contribID = NULL;
     if (!empty($contribParams['invoice_id'])) {
-      $contribID = CRM_Core_DAO::getFieldValue('CRM_Contribute_DAO_Contribution',
+      $contribParams['id'] = CRM_Core_DAO::getFieldValue('CRM_Contribute_DAO_Contribution',
         $contribParams['invoice_id'],
         'id',
         'invoice_id'
       );
     }
 
-    $ids = array();
-    if ($contribID) {
-      $ids['contribution'] = $contribID;
-      $contribParams['id'] = $contribID;
-    }
-
     if (CRM_Contribute_BAO_Contribution::checkContributeSettings('deferred_revenue_enabled')) {
       $eventStartDate = CRM_Utils_Array::value(
         'start_date',