diff --git a/classes/GroupReduction.php b/classes/GroupReduction.php
index 599342844..e258d88fa 100644
--- a/classes/GroupReduction.php
+++ b/classes/GroupReduction.php
@@ -137,6 +137,7 @@ class GroupReductionCore extends ObjectModel
 			SELECT `reduction`
 			FROM `'._DB_PREFIX_.'product_group_reduction_cache`
 			WHERE `id_product` = '.(int)$id_product.' AND `id_group` = '.(int)$id_group);
+		// Should return string (decimal in database) and not a float
 		return self::$reduction_cache[$id_product.'-'.$id_group];
 	}
 
diff --git a/classes/Product.php b/classes/Product.php
index b43e19015..26626c033 100644
--- a/classes/Product.php
+++ b/classes/Product.php
@@ -2720,8 +2720,7 @@ class ProductCore extends ObjectModel
 		if ($use_group_reduction)
 		{
 			$reduction_from_category = GroupReduction::getValueForProduct($id_product, $id_group);
-
-			if (!empty($reduction_from_category) && (float)$reduction_from_category == 0)
+			if ($reduction_from_category !== false)
 				$price -= $price * (float)$reduction_from_category;
 			else // apply group reduction if there is no group reduction for this category
 				$price *= ((100 - Group::getReductionByIdGroup($id_group)) / 100);