diff --git a/filemanager/inc/class.filemanager_ui.inc.php b/filemanager/inc/class.filemanager_ui.inc.php
index 0a46f275d9..e6432d7e7a 100644
--- a/filemanager/inc/class.filemanager_ui.inc.php
+++ b/filemanager/inc/class.filemanager_ui.inc.php
@@ -1020,6 +1020,10 @@ class filemanager_ui
 		{
 			// Query the requested path, in case it's nested
 			$query['col_filter']['path'][] = $query['path'];
+			if(!is_array($query['col_filter']['dir']))
+			{
+				$query['col_filter']['dir'] = $query['col_filter']['dir'] ? [$query['col_filter']['dir']] : [];
+			}
 			foreach($query['col_filter']['path'] as $filter_path)
 			{
 				$query['col_filter']['dir'][] = Vfs::is_dir($filter_path) ? $filter_path : Vfs::dirname($filter_path);