Happens from time to time when killing people in the Hillsbrad raids.

Message: Interface\AddOns\dgks_classic\dgks_classic.lua:1656: attempt to call global 'IsActiveBattlefieldArena' (a nil value) Time: Fri Nov 15 01:44:29 2019 Count: 13

Removing "and not IsActiveBattlefieldArena()" from the 3 relevant places in the lua fixes this.
It's not an API call in classic since there's no arenas yet.

Just a reminder. This issue is still there.
I completely forgot about it, but after the latest patch it started popping up again.

I see I will fix this today. Sorry for the slow response.

This was fixed along time ago.