What steps will reproduce the problem?
1. Finishing a dungeon boss will sometimes trigger a LUA error

What is the expected output? What do you see instead?
Expected output is nothing, LUA error appears.

What version of the product are you using?
v3.5.8

Do you have an error log of what happened?

Message: ADDON_ACTION_BLOCKED: Postal tried to call the protected function 'CompactRaidFrame2:Show()'.
Time: 09/05/16 15:25:11
Count: 5
Stack: [string "safecall Dispatcher[3]"]:4: in function <[string "safecall Dispatcher[3]"]:4>
[string "safecall Dispatcher[3]"]:13: in function ?' ...ore\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:90: in functionFire'
...AddOns\ElvUI\Libraries\AceEvent-3.0\AceEvent-3.0.lua:120: in function <...AddOns\ElvUI\Libraries\AceEvent-3.0\AceEvent-3.0.lua:119>
C: in function Show' Interface\FrameXML\CompactUnitFrame.lua:330: in functionCompactUnitFrame_UpdateVisible'
Interface\FrameXML\CompactUnitFrame.lua:280: in function `CompactUnitFrame_UpdateAll'
Interface\FrameXML\CompactUnitFrame.lua:54: in function <Interface\\FrameXML\\CompactUnitFrame.lua:51>

Locals: <none>

Please provide any additional information below.

This happened on every single defeated boss in Eye of Azshara and Darkheart Thicket Normal. Did not happen on Violet Hold Mythic.