I have made a functional mod which keeps crashing due to a "ConcurrentModificationException" whenever I repeatedly use the Sonar items. The source is at GitHub here: https://github.com/thetdw2000/sonarmod
I suspect that it's caused by the SonarThread class, but I have no idea how to fix it or what's causing it.
crash-2018-05-22_21.10.40-client.txt