Unable to generate automatic installation script on GUI mode

Hi

i'm encountring the following exception when trying to save the automatic installation script at the FinishPanel on GUI mode "java.lang.ClassCastException: [Lcom.izforge.zipack.panels.installationgroup.InstallationGroupPanel$GroupData; cannot be cast to [Lcom.izforge.zipack.panels.installationgroup.GroupData;"

this issue occurs only when the installation run on GUI mode ( no problem with console mode ) and the installer have a InstallationGroupPanel enabled