NFT QOS MONITOR: Error: syntax error, unexpected handle

Hi,

in my log file (WRT1900ACS, current, but this error message is present since a lot of time) I found following error message:

Fri Nov  6 21:31:30 2020 user.notice nft-qos-monitor: ACTION=remove, MACADDR=00:1c:85:0c:63:7e, IPADDR=192.168.0.200, HOSTNAME=
Fri Nov  6 21:31:30 2020 daemon.debug dnsmasq-script[5531]: Error: syntax error, unexpected handle
Fri Nov  6 21:31:30 2020 daemon.debug dnsmasq-script[5531]: delete handle 15
Fri Nov  6 21:31:30 2020 daemon.debug dnsmasq-script[5531]:        ^^^^^^
Fri Nov  6 21:31:30 2020 daemon.debug dnsmasq-script[5531]: Error: syntax error, unexpected handle
Fri Nov  6 21:31:30 2020 daemon.debug dnsmasq-script[5531]: delete handle 16
Fri Nov  6 21:31:30 2020 daemon.debug dnsmasq-script[5531]:        ^^^^^^
Fri Nov  6 21:31:30 2020 user.notice nft-qos-dynamic: ACTION=remove, MACADDR=00:1c:85:0c:63:7e, IPADDR=192.168.0.200, HOSTNAME=

This happens for IP addresses, which have not a static name for the DHCP ( i.e. unknown devices for guest smartphones):

Fri Nov  6 20:01:28 2020 daemon.info dnsmasq-dhcp[5531]: DHCPREQUEST(br-lan) 192.168.0.200 00:1c:85:0c:63:7e
Fri Nov  6 20:01:28 2020 daemon.info dnsmasq-dhcp[5531]: DHCPACK(br-lan) 192.168.0.200 00:1c:85:0c:63:7e
Fri Nov  6 20:01:28 2020 user.notice nft-qos-monitor: ACTION=add, MACADDR=00:1c:85:0c:63:7e, IPADDR=192.168.0.200, HOSTNAME=
Fri Nov  6 20:01:29 2020 user.notice nft-qos-dynamic: ACTION=add, MACADDR=00:1c:85:0c:63:7e, IPADDR=192.168.0.200, HOSTNAME=

How to fix it?

Best regards
dyha