diff --git a/htdocs/core/class/commonobject.class.php b/htdocs/core/class/commonobject.class.php
index 1013da7c430..888d9f66114 100644
--- a/htdocs/core/class/commonobject.class.php
+++ b/htdocs/core/class/commonobject.class.php
@@ -6029,7 +6029,6 @@ abstract class CommonObject
 			}
 
 			$sql .= ")";
-
 			$resql = $this->db->query($sql);
 			if (!$resql) {
 				$this->error = $this->db->lasterror();
@@ -6283,6 +6282,11 @@ abstract class CommonObject
 						$this->array_options["options_".$key] = $this->db->idate($this->array_options["options_".$key]);
 					}
 					break;
+				case 'boolean':
+					if (empty($this->array_options["options_".$key])) {
+						$this->array_options["options_".$key] = null;
+					}
+					break;
 				/*
 				case 'link':
 					$param_list = array_keys($attributeParam['options']);
diff --git a/htdocs/product/class/api_products.class.php b/htdocs/product/class/api_products.class.php
index c3b22adedb2..e2e4a1550b5 100644
--- a/htdocs/product/class/api_products.class.php
+++ b/htdocs/product/class/api_products.class.php
@@ -462,7 +462,7 @@ class Products extends DolibarrApi
 
 		$childsArbo = $this->product->getChildsArbo($id, 1);
 
-		$keys = ['rowid', 'qty', 'fk_product_type', 'label', 'incdec'];
+		$keys = ['rowid', 'qty', 'fk_product_type', 'label', 'incdec', 'ref'];
 		$childs = [];
 		foreach ($childsArbo as $values) {
 			$childs[] = array_combine($keys, $values);