FE8 Chapter 2 - Game crashes when I try to heal a unit

I’m editing FE8, I have replaced all playable units and edited a couple of maps.
For some reason, when I try to heal any unit in Chapter 2 the game freaks out and crashes while making an earsplitting noise. I have no clue as to why this is, so I’m hoping that someone can help me.

I don’t know why, but I’m unable to insert any form of media and/or link, so I can’t show the crash.

Unless you post reproducible data, I don’t think it will be resolved.

If you are using FEBuilderGBA, please post report7z.
You cannot post to FEU, so please use discord or google drive.