mmInitDefault() crashes after multiple calls

[Oopas]

This is my first time to use libnds to make NDS games. When I used this function many times (because I want to read audio files from the filesystem only when needed), I found that the game seemed to crash.

[Oopas]

Through reading the assembly code, I found that this function seems to apply for a piece of memory when it is executed. Is it possible that it is related to this ? But since the source code is not in C, I can't fully understand it and find out the problem.......