This error occurs when I follow a player while he is fighting monsters
But it's not %100. I'm not sure what happened

Are you still getting this error after updating to the most recent?

Message: ...patibility\Classic\Libs\LibClassicDurations\core.lua:570: bad argument #1 to 'next' (table expected, got nil)
Time: Sun Aug 11 15:13:10 2019
Count: 6
Stack: ...patibility\Classic\Libs\LibClassicDurations\core.lua:570: bad argument #1 to 'next' (table expected, got nil)
[C]: in function next' ...patibility\Classic\Libs\LibClassicDurations\core.lua:570: in function <...patibility\Classic\Libs\LibClassicDurations\core.lua:557> (tail call): ? (tail call): ? ...terface\AddOns\ShestakUI\Libs\oUF\Elements\Auras.lua:90: in function <...terface\AddOns\ShestakUI\Libs\oUF\Elements\Auras.lua:76> ...terface\AddOns\ShestakUI\Libs\oUF\Elements\Auras.lua:198: in function <...terface\AddOns\ShestakUI\Libs\oUF\Elements\Auras.lua:192> ...terface\AddOns\ShestakUI\Libs\oUF\Elements\Auras.lua:235: in function func'
Interface\AddOns\ShestakUI\Libs\oUF\oUF.lua:212: in function `UpdateAllElements'
Interface\AddOns\ShestakUI\Libs\oUF\oUF.lua:827: in function <Interface\AddOns\ShestakUI\Libs\oUF\oUF.lua:783>

Locals: (*temporary) = nil
(*temporary) = "table expected, got nil"

I will try to make this error repeat,If I find the error

When this error occurs, if the character moves, "Count" adds up

another lun error,maybe it has something to do with this.
When I watch someone fight, I click on the character and it comes up.

Message: ...patibility\Classic\Libs\LibClassicDurations\core.lua:573: bad argument #1 to 'next' (table expected, got nil)
Time: Mon Aug 12 19:04:54 2019
Count: 5
Stack: ...patibility\Classic\Libs\LibClassicDurations\core.lua:573: bad argument #1 to 'next' (table expected, got nil)
[C]: in function next' ...patibility\Classic\Libs\LibClassicDurations\core.lua:573: in function <...patibility\Classic\Libs\LibClassicDurations\core.lua:560> (tail call): ? (tail call): ? ...terface\AddOns\ShestakUI\Libs\oUF\Elements\Auras.lua:90: in function <...terface\AddOns\ShestakUI\Libs\oUF\Elements\Auras.lua:76> ...terface\AddOns\ShestakUI\Libs\oUF\Elements\Auras.lua:198: in function <...terface\AddOns\ShestakUI\Libs\oUF\Elements\Auras.lua:192> ...terface\AddOns\ShestakUI\Libs\oUF\Elements\Auras.lua:235: in function func'
...nterface\AddOns\ShestakUI\Libs\oUF\EventsClassic.lua:52: in function <...nterface\AddOns\ShestakUI\Libs\oUF\EventsClassic.lua:50>
(tail call): ?

Locals: (*temporary) = nil
(*temporary) = "table expected, got nil"

no yet,if appear lua error, i'll send issues,thx bro

Looked into this and tried adding a safeguard against this error. Unsure if it resolves it yet at this point.