fix issue

web_src/js/features/contexmenu.js

@@ -40,8 +40,9 @@ export default async function initContextMenu() {
                     if (a.currentTarget.parentNode.nextElementSibling) {
                         a.currentTarget.parentNode.style.setProperty('display', 'none', 'important')
                         a.currentTarget.parentNode.nextElementSibling.style.display = 'table-row'
-                        let renameFile = a.currentTarget.getElementsByTagName("a")[0].getAttribute('title')
-                        a.currentTarget.parentNode.nextElementSibling.getElementsByTagName("input")[0].setAttribute("value", renameFile.substr(0, renameFile.indexOf('/')))
+                        const renameFile = a.currentTarget.getElementsByTagName("a")[0].getAttribute('title')
+                        let renameFileValue = renameFile.indexOf('/') !== -1 ? renameFile.substr(0, renameFile.indexOf('/')) : renameFile
+                        a.currentTarget.parentNode.nextElementSibling.getElementsByTagName("input")[0].setAttribute("value", renameFileValue)
 
                     }
                     let btn = a.currentTarget.parentNode.nextElementSibling.getElementsByTagName("button")[0]