Hey there,
Thanks for getting back to me so quickly!
I hadn't seen that error, but I also didn't know they could appear there! I will have to keep an eye out in the future.
As far as VictoryAftermath is concerned, all I see for a line that maybe is where it pulls the XP value from one of the plugin parameters within RPG Maker MZ, under the XP display code:
JS Data (Data:func): return BattleManager._rewards.exp;
I am not a coder (why I buy plugins) so don't know where else I'd look. I have also heard it can be difficult working with VisuStella plugins, as they obfuscate their code. I am hopeful, but I also understand if this is an unfortunate dead end.
Let me know what else you might need to potentially make this work, I will do what I can!