Hi Aerosys! I think something changed with the 1.4.3 version cause there's a bug where it's not showing Followers anymore with that version. I replaced the demo's 1.4.1 to 1.4.3 and the Follower there didn't appear either so it's probably not a conflict. I think combat is still working just fine though. Thanks again for the plugin!
I think i found the culprit. It's Drag and Plugin's Common Event Trigger. It's triggering a common event on xp update and level up. Perchance are you leaving an undefined battler anywhere in the party after battle ends?