unexpected NULL character during export

[ckrisz]

I converted MuseScore_General.sf3 to .sfz with polyphone. This is the default sound bank of MuseScore3.

I want to open it with sforzando but it cannot parse the sf2 file. The reason: end of comment section is followed by a NULL byte, comment00 0A 0A<group
So I have to remove NULL to solve this issue. In other words, comment0A 0A<group works well.

If I delete the last character from the comment in polyphone editor, it exports the content well.