how can I get rid off realname problem

I use ispconfig 2.2.25 on opensuse.

I get an error when I add a email and realname section of the sites;

Field: Real Name
Only the following signs are allowed: a-z A-Z 0-9 - _ .

Whereas I don't use signs which aren't allowed.

How can I get rid off this error ?
Therefore I want to update ispconfig 2.2.lastversion.

How can I update my ispconfig to new version without causing any problem ?

Thanks

 

Code:

tar xvfz ISPConfig-2.2.31.tar.gz
cd install_ispconfig
./setup

(see http://www.howtoforge.com/forums/showthread.php?t=33188 )