Get while in combat and selecting quest to track

Message: Interface\AddOns\Carbonite.Quests\NxQuest.lua:4741: assertion failed!
Time: 07/26/17 09:10:31
Count: 1
Stack: Interface\AddOns\Carbonite.Quests\NxQuest.lua:4741: assertion failed!Interface\SharedXML\SharedBasicControls.lua:204: in function <Interface\SharedXML\SharedBasicControls.lua:203>
[C]: ?
[C]: in function assert' Interface\AddOns\Carbonite.Quests\NxQuest.lua:4741: in function FindCur'
Interface\AddOns\Carbonite.Quests\NxQuest.lua:9613: in function UserFunc' Interface\AddOns\Carbonite\NxUI.lua:6508: in function UserFunc'
Interface\AddOns\Carbonite\NxUI.lua:3680: in function <Interface\AddOns\Carbonite\NxUI.lua:3662>

Locals: errorMessage = "Interface\AddOns\Carbonite.Quests\NxQuest.lua:4741: assertion failed!"
DisplayMessageInternal = defined @interface\SharedXML\SharedBasicControls.lua:187
MESSAGE_TYPE_ERROR = 0