[Kubuntu] (node:18092) UnhandledPromiseRejectionWarning: Error: ERR_INVALID_URL (-300) loading ''

Description

Steps to Reproduce the Problem

1. download my project https://github.com/Darkempire78/Fast-Clipboard-Recover
2. npm i / npm start

Error

(node:18092) UnhandledPromiseRejectionWarning: Error: ERR_INVALID_URL (-300) loading ''
    at rejectAndCleanup (electron/js2c/browser_init.js:213:985)
    at Object.failListener (electron/js2c/browser_init.js:213:1198)
    at Object.emit (events.js:315:20)
    at NavigationController.loadURL (electron/js2c/browser_init.js:213:2102)
    at BrowserWindow.n.loadURL (electron/js2c/browser_init.js:33:1779)
    at Menubar.<anonymous> (/home/darkempire/Bureau/Fast-Clipboard-Recover/node_modules/menubar/lib/Menubar.js:360:66)
    at step (/home/darkempire/Bureau/Fast-Clipboard-Recover/node_modules/menubar/lib/Menubar.js:57:23)
    at Object.next (/home/darkempire/Bureau/Fast-Clipboard-Recover/node_modules/menubar/lib/Menubar.js:38:53)
    at /home/darkempire/Bureau/Fast-Clipboard-Recover/node_modules/menubar/lib/Menubar.js:32:71
    at new Promise (<anonymous>)
(Use `electron --trace-warnings ...` to show where the warning was created)
(node:18092) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:18092) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

Specifications

• Menubar version: 9.0.5
• Platform: Kubuntu v20.04.02 LTS, KDE
• Electron version: 13.1.7

Other information

I use electron-forge

Reproduce the report with npm i and npm start using the linked Fast-Clipboard-Recover project, then inspect the failing Menubar.loadURL call at node_modules/menubar/lib/Menubar.js:360 and the Electron NavigationController.loadURL stack. Done means the application starts without ERR_INVALID_URL or an unhandled promise rejection.