diff --git a/conlite/main.php b/conlite/main.php
index 70a7717..a78a5d2 100644
--- a/conlite/main.php
+++ b/conlite/main.php
@@ -82,7 +82,7 @@ if ($cfg["use_pseudocron"] == true) {
 
 /* Remove all own marks, only for frame 1 and 4  if $_REQUEST['appendparameters'] == 'filebrowser'
   filebrowser is used in tiny in this case also do not remove session marks */
-if (($frame == 1 || $frame == 4) && isset($_REQUEST['appendparameters']) && $_REQUEST['appendparameters'] != 'filebrowser') {
+if (($frame == 1 || $frame == 4) && (empty($_REQUEST['appendparameters']) || $_REQUEST['appendparameters'] != 'filebrowser')) {
     $col = new InUseCollection;
     $col->removeSessionMarks($sess->id);
 }