report4.php "Reports -> Notifications" not working HTTP ERROR 500 (Zabbix 7.4.5)

[SZ_CGT]

Hi All
I have found just now, but I don't know since when is not working, the page /zabbix/report4.php of my server Zabbix v7.4.5 is not working (I'm accessing as Admin Zabbix, so it's not a problem of permissions)
I needed to modify a set of notifications or report but I recieve "white page" HTTP Error 500

Any Idea?

Thanks
Simone