pfSense

PHP ERROR: Type: 1, File: /etc/inc/services.inc, Line: 1411, Message: Uncaught TypeError: implode(): Argument #1 ($array) must be of type array, string given in /etc/inc/services.inc:1411
Stack trace:
#0 /etc/inc/services.inc(1411): implode(', ', NULL)
#1 /etc/inc/services.inc(1006): services_kea4_configure()
#2 /usr/local/pfSense/include/www/system_advanced_network.inc(258): services_dhcpd_configure()
#3 /usr/local/www/system_advanced_network.php(47): saveAdvancedNetworking(Array)
#4 {main}
thrown @ 2023-11-16 13:18:52

Steps to reproduce:
1.) Make sure that the ISC DHCP (Deprecated) Backend server is selected under System/Advanced/Networking
2.) Go to Services/DHCP Server/LAN.
3.) Click on the Add Address Pool button.
4.) Define a new Address Pool Range and at least one WINS server. Save the pool settings.
5.) Go back to the System/Advanced/Networking and select Kea DHCP then save the changes.

You'll get the same PHP error if you directly define an additional pool in KEA DHCP and enter a WINS server there.