Bug: Kicked while changing type of NPC

### In which plugin has the error occurred?

FancyNpcs

### What happened?

This error appears, when executing `/npc type name tpye`

### In which software has the error occurred?

Paper

### Plugin version

2.6.0.280

### Server version

1.21.6

### Relevant log output

```shell
none, works fine except for packets
```