update

@@ -255,7 +255,7 @@ class UpdateSeoTdk extends Command
                     }
                     if($json_field){
                         $old_data = json_decode($v[$field_arr[0]], true);
-                        foreach ($old_data as $kk=>$vv){
+                        foreach ($old_data ?: [] as $kk=>$vv){
                             empty($data[$json_field][$kk]) && $data[$json_field][$kk] = $vv;
                         }
                         $data[$json_field] = json_encode($data[$json_field]);