diff --git a/application/Espo/Modules/Crm/Services/Opportunity.php b/application/Espo/Modules/Crm/Services/Opportunity.php
index 7f15101bfb..bf055ab987 100644
--- a/application/Espo/Modules/Crm/Services/Opportunity.php
+++ b/application/Espo/Modules/Crm/Services/Opportunity.php
@@ -311,7 +311,7 @@ class Opportunity extends \Espo\Services\Record
 
         $today = new \DateTime();
 
-        $endPosition = count($keyList) - 1;
+        $endPosition = count($keyList);
         for ($i = count($keyList) - 1; $i >= 0; $i--) {
             $key = $keyList[$i];
             $dt = new \DateTime($key . '-01');