Novell Client 2 SP3 silent uninstallation unwanted reboot

We want to deploy the Novell Client 2 SP3 with asoftware package (Empirum).
Silent installation works fine, but silent uninstallation makes unwanted reboot.

Silent uninstallation command line:
rundll32.exe "C:\Program Files\Novell\Client\ncsetup.dll" NWUninstallClient /s

I search hours for a reboot suppress switch - without success.
Does somebody know a switch or way to suppress the reboot?