diff --git a/htdocs/variants/class/ProductCombination.class.php b/htdocs/variants/class/ProductCombination.class.php
index f19c81960db..128c1974c77 100644
--- a/htdocs/variants/class/ProductCombination.class.php
+++ b/htdocs/variants/class/ProductCombination.class.php
@@ -327,7 +327,10 @@ class ProductCombination
 		$child = new Product($this->db);
 		$child->fetch($this->fk_product_child);
 		$child->price_autogen = $parent->price_autogen;
-		$child->weight = $parent->weight + $this->variation_weight;
+		$child->weight = $parent->weight;
+		if ($this->variation_weight) {	// If we must add a delta on weight
+			$child->weight = ($child->weight ? $child->weight : 0) + $this->variation_weight;
+		}
 		$child->weight_units = $parent->weight_units;
 		$varlabel = $this->getCombinationLabel($this->fk_product_child);
 		$child->label = $parent->label.$varlabel;