Export deprecated realm file into JSON


I would like to export a realm file into Json. Long story short I downloaded an app and try to extract part of its text content. So I have no experience at all with realm studio. I first had to downgrade the version of realm studio in order to open the file without having to upgrade it. When I try to export it into JSON I have the following error message: “Failed to export data maximum call stack size exceeded”.

How can I convert this file into JSON ?