JavaScript Error on Start

[FatherOfAlways]

Immediately upon launching the app I get the following error:

A JavaScript error occurred in the main process
Uncaught Exception:
TypeError: Error processing argument at index 0, conversion failure from undefined
at Object.createTrayIcon (/Applications/Pushover.app/Contents/Resources/app/lib/webpack:/nativefier-placeholder/src/components/trayIcon.ts:13:32)
at App.<anonymous> (/Applications/Pushover.app/Contents/Resources/app/lib/webpack:/nativefier-placeholder/src/main.ts:163:5)
at App.emit (events.js:315:20)

When I click OK nothing happens, the window stays empty.

I'm using macOS 12.0.1.

[uhlhosting]

Uncaught Exception:
TypeError: Error processing argument at index 0, conversion failure from undefined
at Object.createTrayIcon (/Applications/Pushover.app/Contents/Resources/app/lib/webpack:/nativefier-placeholder/src/components/trayIcon.ts:13:32)
at App.<anonymous> (/Applications/Pushover.app/Contents/Resources/app/lib/webpack:/nativefier-placeholder/src/main.ts:163:5)
at App.emit (events.js:315:20)

I got the same.