Aggregate graph blank screen

[phantasm]

Hi all

In cacti Version 0.8.8b when i create Aggregate graph and with Totaling "print totaling Legend items only" after 1 minute blank output return , Aggregate plugin is version 0.75 , i try to uninstall and install / disable and enable it but nothing changes .
i haven't find any logs related to this output .tcpdump output is length 0 for this request .

any idea PLZ?

[phantasm]

any idea ?