ProxySG- showing undefined instead of login user name

Hi Team,

I have recently upgraded my proxy device from 6.7.3.12 to 6.7.4.8.

but after upgrade we have noticed that login user name showed as undefined in new version. but older version (6.7.3.12) showing the username (logout admin )

i.e:  Logout <undefined>

Please advise on this. PFA error screenshot.

Thanks,

Ram