diff --git a/htdocs/commande/class/commande.class.php b/htdocs/commande/class/commande.class.php
index 2805f4556d3..f601606be33 100644
--- a/htdocs/commande/class/commande.class.php
+++ b/htdocs/commande/class/commande.class.php
@@ -1368,7 +1368,7 @@ class Commande extends CommonOrder
 		}
 		// Possibility to add external linked objects with hooks
 		$this->linked_objects[$this->origin] = $this->origin_id;
-		if (is_array($object->other_linked_objects) && !empty($object->other_linked_objects)) {
+		if (isset($object->other_linked_objects) && is_array($object->other_linked_objects) && !empty($object->other_linked_objects)) {
 			$this->linked_objects = array_merge($this->linked_objects, $object->other_linked_objects);
 		}
 
diff --git a/htdocs/commande/tpl/linkedobjectblock.tpl.php b/htdocs/commande/tpl/linkedobjectblock.tpl.php
index 428589aa844..a0641c4c493 100644
--- a/htdocs/commande/tpl/linkedobjectblock.tpl.php
+++ b/htdocs/commande/tpl/linkedobjectblock.tpl.php
@@ -47,7 +47,7 @@ foreach ($linkedObjectBlock as $key => $objectlink) {
 	}
 	echo '<tr class="'.$trclass.'" >';
 	echo '<td class="linkedcol-element" >'.$langs->trans("CustomerOrder");
-	if (!empty($showImportButton) && $conf->global->MAIN_ENABLE_IMPORT_LINKED_OBJECT_LINES) {
+	if (!empty($showImportButton) && !empty($conf->global->MAIN_ENABLE_IMPORT_LINKED_OBJECT_LINES)) {
 		print '<a class="objectlinked_importbtn" href="'.$objectlink->getNomUrl(0, '', 0, 1).'&amp;action=selectlines" data-element="'.$objectlink->element.'" data-id="'.$objectlink->id.'"  > <i class="fa fa-indent"></i> </a';
 	}
 	echo '</td>';