Hi Teneombre!
I've noticed that this can occur if the player's character is replaced during a game without an event being thrown. For instance, this occurs if you activate God mode and then deactivate it again. The player's character has been replaced with a new entity, but no creation event is thrown to inform my mod of the change. Some mods do this as well.
I'm still working on potential fixes for this, but it's hard to do from my end. In the meantime, you can usually fix this by triggering a table reset (Ctrl + Alt + Shift + Backspace by default).
If you notice it starting to happen too frequently, or if this fix doesn't work, let me know and I'll take a closer look.