Using psadmin to script a restart of weblogic - 8.52

Hi all,

trying to script a nightly restart of my weblogic servers.  From a script perspective I have success, however when it comes to restarting weblogic I encounter this:

$PS_HOME/bin/psadmin -w shutdown <DOMAIN>

Stopping the domain.

General Exception: null

java.lang.NullPointerException

        at com.peoplesoft.pt.psadmin.ui.Progress.<init>(Progress.java:92)

        at com.peoplesoft.pt.psadmin.pia.DomainShutdownHandler.run(DomainShutdownHandler.java:84)

        at com.peoplesoft.pt.psadmin.pia.PIAAdminCmdLine.run(PIAAdminCmdLine.java:330)

        at com.peoplesoft.pt.psadmin.PSAdmin.runSwitched(PSAdmin.java:170)

        at com.peoplesoft.pt.psadmin.PSAdmin.main(PSAdmin.java:232)

I have slightly more success with psadmin -w shutdown! <DOMAIN>, but even then I still see the same error some of the time from a script run in a terminal session & 100% of the time when initiated via cron.