kid3 crashes when editing TOC

I found a sequence of steps that reliably leads to a crash on macOS 10.13.6 with kid3 3.8.4.

1. Select MP3 with ID3v2.4 tag.
2. Add Table of Contents tag.
3. Edit Table of Contents tag.
4. Add Chapter frame, in frame editor click OK. (At this point I would expect the frame table to show “chp” as value for the chapter frame but an empty value is shown.)
5. Click OK to close TOC frame editor.
6. Click Edit on the TOC frame.
7. Select the Chapter frame, enter a value (e.g. “1”) into the frame table.
8. Click OK to close TOC frame editor.

At this point kid3 crashes.