FOSS gamedev and creative worlds

Client crash after editing text in sign at all servers with version 0.4.13 (don't know about other versions of servers). I can't get more information because this is report some player. iPad, game from Apple store. Does anybody can check this bug?

You are playing an illegally distributed version of Minetest, made by someone else.
We won't be able to help you, you need to contact the author.