We're working on a fix to avoid corrupt saves crashing the menus! The problem seems to be caused by having a corrupt save in your save folder. In the meantime, the workaround solution is to manually delete all the saves in your save folder to make sure it's clear of the corrupt save. If you're playing in the browser, clear your cache and cookies to clear the save folder, if you're playing on a downloaded version, refer to this guide here to find the save folder. https://anduogames.wordpress.com/2018/02/09/guide-to-save-files-in-third-crisis/
Hope this helps!