Can't start Principle anymore

Hi, I’ve been using Principle for a few years now and never had a problem until now.

Since a few weeks, I can’t launch Principle anymore. When I try to start the app, my iMac begins to freeze and display strange black shapes / glitches.

I’ve updated to the latest version of Principle, uninstalled, reinstalled. Nothing works.

I’m using macOS Mojave. Latest version of Sketch and Principle.

Here’s what it looks like when I try to start Principle :