Critical error on file saving

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35444 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
4.9.304

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35445 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e