This is a fix found in the upstream 2.16.2 control-center package that prevents a possible NULL pointer dereference. It can happen in situations where dbus is not available when gnome-session is run. Unfortunately, I don't have explicit reproduction information, but the patch is obviously correct and harmless.
Created attachment 141782 [details] the patch
This request was evaluated by Red Hat Product Management for inclusion in a Red Hat Enterprise Linux major release. Product Management has requested further review of this request by Red Hat Engineering, for potential inclusion in a Red Hat Enterprise Linux Major release. This request is not yet committed for inclusion.
Fix included in control-center-2.16.0-13.el5
Verified attached patch had been included in control-center-2.16.0-13.el5.
control-center-2.16.0-13.el5 has been included in RHEL5-Client-20061201.0, so resolve this bug.