Update wizard from 6.4.1 to 6.4.2 don't end normaly

I updated the debian package from 6.4.1 to 6.4.2 and then entered the xwiki wizard.

At the end of the installation of the new 6.4.2, the wizard default option is to uninstall the newly installed 64.2 wiki pages... if you click on it, it uninstall all 6.4.2 pages and then it gives you an option to install them again.

I had to postpone the installation to exit this loop.