On trying to export the favorites a empty starred*.json file downloads.
I use v1.6.1 on SQLite.
Would like to change to MySQL/MariaDB and would like to keep my favorites.

There are 2 users, one of them have only few favorites <50 (the export works there).
The other one have about 5000 favorites, there could be downloaded only empty file.

Is the export limited to a certain number of favorites?
I also tryed to export with the command line, the starred file was also empty.