Null Pointer Exception stops the plugin from working

ModelEngine version: Latest premium (4.0.8)

Paper: 1.21.4-222-main@9b1798d

Log: https://mclo.gs/AXpGz8u

Description of problem: ModelEngine occasionally throws the following error. Afterwards, the plugin stops functioning, almost like it's been uninstalled from the server. I'd love for this to be a high priority bugfix because it totally grinds the plugin to a halt, although I understand it's a hard fix. Maybe a == null check is all that's needed?

Let me know if I can give any more info and thanks in advance!