4x ...ns/Blizzard_AchievementUI/Blizzard_AchievementUI.lua:346: attempt to get length of local 'buttons' (a nil value)
[string "@Blizzard_AchievementUI/Blizzard_AchievementUI.lua"]:346: in function `AchievementFrameCategories_Update'
[string "@Blizzard_AchievementUI/Blizzard_AchievementUI.lua"]:273: in function <...ns/Blizzard_AchievementUI/Blizzard_AchievementUI.lua:272>
[string "=[C]"]: ?
[string "=[C]"]: ?
[string "=[C]"]: in function `Show'
[string "@Krowi_AchievementFilter/Globals.lua"]:420: in function `AchievementFrame_ToggleAchievementFrame'
[string "@Interface_Wrath/FrameXML/UIParent.lua"]:573: in function `ToggleAchievementFrame'
[string "TOGGLEACHIEVEMENT"]:1: in function <[string "TOGGLEACHIEVEMENT"]:1>

Locals:
scrollFrame = AchievementFrameCategoriesContainer {
 0 = <userdata>
 scrollDown = AchievementFrameCategoriesContainerScrollBarScrollDownButton {
 }
 scrollChild = AchievementFrameCategoriesContainerScrollChild {
 }
 ScrollChild = AchievementFrameCategoriesContainerScrollChild {
 }
 scrollUp = AchievementFrameCategoriesContainerScrollBarScrollUpButton {
 }
 scrollBar = AchievementFrameCategoriesContainerScrollBar {
 }
}
categories = <table> {
}
offset = 0
buttons = nil
displayCategories = <table> {
}
selection = "summary"
parent = nil
numCategories = 0
(*temporary) = <table> {
}
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = "attempt to get length of local 'buttons' (a nil value)"
displayCategories = <table> {
}