migration is ok again (remains probleme of ram consuming > 4Go for users

web/modules/custom/materio_id/materio_id.module

@@ -7,13 +7,13 @@ function computed_field_field_index_compute($entity_type_manager, $entity, $fiel
   // ksm($fields);
   // ksm($delta);
   $famille = $entity->get('field_famille')->getValue()[0]['value'];
-  
+
   // $entity->isNew(); ??
   // TODO: what if familly change ?
   if (!empty($entity->field_index->value)) {  // the node is not new
 	  return $entity->field_index->value;
 	}
-  
+
   // the node is new
   // get all same entities in same family
   $query = \Drupal::entityQuery($entity->getEntityTypeId())
@@ -21,17 +21,22 @@ function computed_field_field_index_compute($entity_type_manager, $entity, $fiel
     ->condition('field_famille', $famille)
     ->sort('field_index', 'DESC')
     ->range(0,1);
-  
+
   $nids = $query->execute();
-    
+
+  $index = null;
 	if(is_array($nids)){
-    $last = entity_load($entity->getEntityTypeId(), array_pop($nids)); 
-	  // get identifiants fo these entities
-	  $index = $last->get('field_index')->getValue()[0]['value'] + 1;
-	}else{
-		$index = '1';
+    $nid = array_pop($nids);
+    if ($nid) {
+      $last = entity_load($entity->getEntityTypeId(), array_pop($nids));
+      // get identifiants fo these entities
+      $index = $last->get('field_index')->getValue()[0]['value'] + 1;
+    }
 	}
-  return $index;
+  // if(!$index){
+	// 	$index = '1';
+	// }
+  return $index ? $index : '1';
 }
 
 
@@ -69,7 +74,7 @@ function materio_id_form_node_materiau_edit_form_alter(&$form, \Drupal\Core\Form
     // dsm($family);
     $form['field_famille']['widget']['#disabled'] = true;
   }
-  
+
   // adding reference to the form title
   $ref = $node->field_reference->value;
   // dsm($ref);