Issue when creating a new tab in macOS Mojave

[nuotsu]

An issue is happening on macOS Mojave...

The app turns all white and becomes unusable after trying to create a new tab (both from the menubar and with keyboard shortcuts).

Same thing happens when changing a directory (cd ../foo) to and from another directory.

[iGallina]

For me it happens when opening the UpTerm app, even when using Mojave on White Theme. I've seen as issue on Electron repo that maybe would help this https://github.com/electron/electron/issues/13387