diff --git a/htdocs/core/class/commonobject.class.php b/htdocs/core/class/commonobject.class.php
index b04f5430adc75..5c8fb1cfebf2d 100644
--- a/htdocs/core/class/commonobject.class.php
+++ b/htdocs/core/class/commonobject.class.php
@@ -4847,6 +4847,15 @@ public function isObjectUsed($id = 0, $entity = 0)
 		$haschild = 0;
 		foreach ($arraytoscan as $table => $element) {
 			//print $id.'-'.$table.'-'.$elementname.'<br>';
+
+			// Check if module is enabled (to avoid error if tables of module not created)
+			if (isset($element['enabled']) && !empty($element['enabled'])) {
+				$enabled = (int) dol_eval($element['enabled'], 1);
+				if (empty($enabled)) {
+					continue;
+				}
+			}
+
 			// Check if element can be deleted
 			$sql = "SELECT COUNT(*) as nb";
 			$sql .= " FROM ".$this->db->prefix().$table." as c";
diff --git a/htdocs/product/class/product.class.php b/htdocs/product/class/product.class.php
index 44ea25236e627..f14814bc21086 100644
--- a/htdocs/product/class/product.class.php
+++ b/htdocs/product/class/product.class.php
@@ -87,9 +87,9 @@ class Product extends CommonObject
 		'contratdet' => array('name' => 'Contract', 'parent' => 'contrat', 'parentkey' => 'fk_contrat'),
 		'facture_fourn_det' => array('name' => 'SupplierInvoice', 'parent' => 'facture_fourn', 'parentkey' => 'fk_facture_fourn'),
 		'commande_fournisseurdet' => array('name' => 'SupplierOrder', 'parent' => 'commande_fournisseur', 'parentkey' => 'fk_commande'),
-		'mrp_production' => array('name' => 'Mo', 'parent' => 'mrp_mo', 'parentkey' => 'fk_mo' ),
-		'bom_bom' => array('name' => 'BOM'),
-		'bom_bomline' => array('name' => 'BOMLine', 'parent' => 'bom_bom', 'parentkey' => 'fk_bom'),
+		'mrp_production' => array('name' => 'Mo', 'parent' => 'mrp_mo', 'parentkey' => 'fk_mo', 'enabled' => 'isModEnabled("mrp")'),
+		'bom_bom' => array('name' => 'BOM', 'enabled' => 'isModEnabled("bom")'),
+		'bom_bomline' => array('name' => 'BOMLine', 'parent' => 'bom_bom', 'parentkey' => 'fk_bom', 'enabled' => 'isModEnabled("bom")'),
 	);
 
 	/**