if an application only crashes with one user, most of the times the local configuration files of that user are to blame.
You can safely delete its configuration files, the application will then default to the system configuration.
configuration files of kde applications can be found in ~/.kde/share/config and ~/.kde/share/apps/application_name
if you don't want to delete the files, you could also rename them to something else, that way you can always restore them if the result is worse then expected.