Error log files appearing in stable server files since 15th October on every restart of server - files of 300B each

Am sure I have seen this issue posted before but cannot find it

containing

there are also other error files under log storage that are less benign - 200 kb each per server record

these have been appearing since at least 21st Oct

these are also a pain because you have to enter each session id to delete them

no error files . . . . unless its something I can or need to do something about

its a pain deleting them

from 1.30.164078 to 1.30.164289 stable build but also appearing in exp builds

no error files unless I need to fix something or I have made a mistake some where