Strange log flood after connecting to with PPTP


After after connecting to my router via PPTP, I get this line endlessly flooding my log file:
Wed Oct 12 23:22:02 2022 daemon.warn dnsmasq[1]: failed to create listening socket for fe80::c0b3:a711:aef9:3043%ppp0: Address not available

my /etc/config/pptpd file looks like this:

config service 'pptpd'
        option 'enabled' '1'
        option 'localip' ''
        option 'remoteip' ''

config 'login'
        option 'username' 'user1'
        option 'password' 'pass2'

What can I do to stop this flooding my log file?