diff --git a/local/ilsa_update_dev.php b/local/ilsa_update_dev.php
index e193125..e18ce52 100644
--- a/local/ilsa_update_dev.php
+++ b/local/ilsa_update_dev.php
@@ -2362,6 +2362,13 @@ if(!in_array("simulate", $GLOBALS['argv']))
 		$model = $sitemap_all_models_search_ob->GetFields();
 		$model['PROPERTIES'] = $sitemap_all_models_search_ob->GetProperties();
 
+		if($sitemap_catalog[$model['PROPERTY_BRAND_UID_VALUE']]['MODELS'] === null)
+		{
+			$sitemap_catalog[$model['PROPERTY_BRAND_UID_VALUE']] = [
+				'MODELS' => [], 
+			];
+		}
+
 		array_push($sitemap_catalog[$model['PROPERTY_BRAND_UID_VALUE']]['MODELS'], $model);
 	}