My QtCreator segfault when pressing Ctrl+P (print)

Calling the Print feature of QtCreator makes it crash.
Running it in a terminal, this is the output:

============
/usr/share/mime/text/plain.xml:1: parser error : Extra content at the end of the document

^
call callback
zsh: segmentation fault qtcreator
============

All plain.xml have in its first line is an innofensive `<?xml version="1.0" encoding="utf-8"?>`.