Update ProgressUI.php

7-Zip File Manager/ProgressUI.php

@@ -65,7 +65,7 @@ var f_rand = "<?php echo $_GET["rand"] ?>";
 var f_file = "<?php echo $_GET["file"] ?>";
 var f_dir = "<?php echo $_GET["dir"] ?>";
 var f_size = "<?php echo filesize($_GET["file"]); ?>";
-var f_destdir = "<?php echo $_GET["destdir"]; ?>";
+var f_destdir = "<?php echo $_GET["destdir"] ?? ""; ?>";
 var f_time = 1;
 var f_totaltime = 1;
 var f_cancel = false;
@@ -223,4 +223,4 @@ function f_close(){
 	}
 }
 </script>
-</html>
+</html>