cannot add static ip pihole 5

Expected Behaviour:

trying to add a static ip in dhcp in pihole 5 running on a centos lxc container

Actual Behaviour:

i get this error
MAC address (16:C7:27:5C:CB:AE) is invalid!
There was a problem applying your settings.
Debugging information:
PHP error (2): filter_var() expects parameter 2 to be long, string given in /var/www/html/admin/scripts/pi-hole/php/savesettings.php:56
i tried to add the ip in 04-pihole-static-dhcp.conf
the file didn't exist and when i created it with one entry it didn't work either

Debug Token:

https://tricorder.pi-hole.net/r6wmva33in

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