I'm seeing this on a customer's 7005 local controller recently updated to 6.5.1.1, but according to them it's been happening for a while, perhaps since updating to 6.5 code.
I can't imagine this being anything other than a bug. It appears to be mostly harmless except for the fact this message is logged every 6 seconds, filling up the onboard log and cluttering the syslog files with garbage.