Usually Eddie crashing will do this.. In this case its not the clients fault though. I was connected to Phoenix when I read the thread, but Im disconnected now and Eddie is closed and Im replying from my actual ISP connection. Just opened a couple other sites to make sure it was still on. Running Mojave as well, 10.14.3 as of the update yesterday, and its worked fine since I installed the OS last month. Ive been running the latest beta of Eddie since it came out.
The only issue Im having with it on 10.14 is it keeps setting off Lulu the network monitor trying to connect to one of the Air servers constantly. I shouldn't be getting a notification as I allowed the Eddie.app any outgoing connection. Lulu is an open source Little Snitch alternative btw..
Try deleting the preferences in the ~/.airvpn folder. Mojave has a handy shortcut now to show you the hidden directories. Open your home folder, hit CMD+Shift+period, delete the now visible .airvpn folder and start from scratch. Occasionally the prefs just go bad. This has fixed 99% of any issues Ive had with Eddie.