Twitch client installed classic/retail version on retail/classic
retail 8.3.30-16-g8906731

Describe the bug

When I enter dungeons I sometimes randomly get this error

Do you have an error log of what happened?

Message: Interface\AddOns\DBM-Core\DBM-Core.lua:6481: attempt to compare number with nil
Time: Sat Aug 8 21:37:14 2020
Count: 1
Stack: Interface\AddOns\DBM-Core\DBM-Core.lua:6481: attempt to compare number with nil
[string "@interface\AddOns\DBM-Core\DBM-Core.lua"]:6481: in function <Interface\AddOns\DBM-Core\DBM-Core.lua:6480>
[string "@interface\AddOns\DBM-Core\DBM-Core.lua"]:6489: in function StartLogging' [string "@Interface\AddOns\DBM-Core\DBM-Core.lua"]:4022: in function func'
[string "@interface\AddOns\DBM-Core\DBM-Core.lua"]:1818: in function <Interface\AddOns\DBM-Core\DBM-Core.lua:1809>

Locals: (*temporary) = nil
(*temporary) = nil
(*temporary) = "attempt to compare number with nil"
LastInstanceMapID = 1594
difficultyModifier = nil

To Reproduce

Screenshots

Did you try having DeadlyBossMods as the only enabled addon and everything else (especially something like ElvUI) disabled?
yes
Which version of DeadlyBossMods are you using?
8.3.30-16-g8906731
Was it working in a previous version? If yes, which was the last good one?
yes,8.3.30-13-g2f0682a
Additional context

Duplicate of bug #286