diff --git a/classes/SpecificPriceRule.php b/classes/SpecificPriceRule.php
index f58edd76c..4b9f2fadc 100644
--- a/classes/SpecificPriceRule.php
+++ b/classes/SpecificPriceRule.php
@@ -266,6 +266,8 @@ class SpecificPriceRuleCore extends ObjectModel
 
                 $result = array_merge($result, Db::getInstance()->executeS($query));
             }
+            // Remove duplicate after the array_merge
+            $result = array_unique($result, SORT_REGULAR);
         } else {
             // All products without conditions
             if ($products && count($products)) {