https://forum.openwrt.org/t/solved-dnsmasq-restart-shows-dhcp-error/19359/2 #by slh
If it doesn't work, remove the created static lease using LuCI and add the following to workpc.conf
dhcp-host=60:a5:e2:27:01:1e,WINWYN523333,192.168.1.132,12h
Do not forget to restart the dnsmasq service.