trying to fix PHP Fatal error: Cannot use [] for reading

sites/all/modules/gui/materiobasemod/materio_admin.module

@@ -292,7 +292,7 @@ function _materio_admin_batch_fixterm_ref_op($nid, $src_tid, $target_field){
     }
     if(!in_array($src_tid, $flat_items)){
       // $items[] = array('tid'=>$src_tid);
-      $node->$target_field[LANGUAGE_NONE][] = array('tid'=>$src_tid);
+      $node->{$target_field}[LANGUAGE_NONE][] = array('tid'=>$src_tid);
     }
 
     // $items = array(LANGUAGE_NONE => array());