What steps, if any, have you tried to fix or identify it?
How is your router set up? What features are you using on it? Does disabling one or two change the message logged?
Have you tried rebooting the router? Wait for a good 10 minutes afterward to see if there is any change/improvement.
Also, the firmware version would be helpful along with any other relevant information regarding your network configuration and usage too.
Diversion, Skynet, YazFi, scribe, connmon, ntpMerlin, scMerlin, uiDivStats, uiScribe, Unbound, FlexQoS, disk checker, on Ext4 w/J + 10GB swap file
RT-AX86U in wired backhaul (2.5GbE) AiMesh mode main router with GT-AX6000 AiMesh node.
https://www.snbforums.com/members/l-ld.24423/#about