it's a problem in libjsoncpp library please archive the issue but marked that any other changes in libjsoncpp can again produce same error:
https://bugs.debian.org/733974 i if dessire can be archived, but i thing (due debvian does not use the build in jsoncpp of minetest sources) must be take in more carefully i made packages for those people that need solution over current instllation THAT CANNOT BE UPGRADE DUE HARDWARE ARE NOT SUPPORTED BY NEWER KERNEL, also due Debian are too bussines-protocol complicated (several years later i must find the bug mby myselft event play the game) current: ttps://build.opensuse.org/project/show/home:vegnuli:minetest in future i'll move it to https://build.opensuse.org/project/show/home:vegnuli:games Lenz McKAY Gerardo (PICCORO) http://qgqlochekone.blogspot.com