I got this weird pop-up logging into a Tauren at Camp Narache

Message: Interface\AddOns\AllTheThings\AllTheThings.lua:4427: attempt to call field 'RecipeChecker' (a nil value)
Time: Sat Sep 29 11:03:29 2018
Count: 1
Stack: Interface\AddOns\AllTheThings\AllTheThings.lua:4427: attempt to call field 'RecipeChecker' (a nil value)
Interface\AddOns\AllTheThings\AllTheThings.lua:4427: in function <Interface\AddOns\AllTheThings\AllTheThings.lua:4421>
Interface\AddOns\AllTheThings\AllTheThings.lua:5544: in function <Interface\AddOns\AllTheThings\AllTheThings.lua:5495>
Interface\AddOns\AllTheThings\AllTheThings.lua:5587: in function <Interface\AddOns\AllTheThings\AllTheThings.lua:5584>
Interface\AddOns\AllTheThings\AllTheThings.lua:5516: in function <Interface\AddOns\AllTheThings\AllTheThings.lua:5495>
Interface\AddOns\AllTheThings\AllTheThings.lua:5587: in function <Interface\AddOns\AllTheThings\AllTheThings.lua:5584>
Interface\AddOns\AllTheThings\AllTheThings.lua:7574: in function `GetDataCache'
Interface\AddOns\AllTheThings\AllTheThings.lua:9971: in function <Interface\AddOns\AllTheThings\AllTheThings.lua:9967>
Interface\AddOns\AllTheThings\src\base.lua:8: in function <Interface\AddOns\AllTheThings\src\base.lua:8>

Locals: t =

{
itemID = 37598
b = 1
u = 1
parent = {
}
lvl = 40
spellID = 48954
}
key = "collected"
(*temporary) = nil
(*temporary) = "CollectedSpells"
(*temporary) = 48954
(*temporary) = "attempt to call field 'RecipeChecker' (a nil value)"
app = AllTheThings {
0 =
CreatePetType = defined @interface\AddOns\AllTheThings\AllTheThings.lua:4639
BaseDifficulty = {
}
SetDataMember = defined @interface\AddOns\AllTheThings\AllTheThings.lua:103
UniqueModeItemRemovalHelperBase = defined @interface\AddOns\AllTheThings\AllTheThings.lua:5836
UniqueModeItemCollectionHelper = defined @interface\AddOns\AllTheThings\AllTheThings.lua:5773
CreateAchievementCriteria = defined @interface\AddOns\AllTheThings\AllTheThings.lua:3333
RecursiveClassAndRaceFilter = defined @interface\AddOns\AllTheThings\AllTheThings.lua:5447
SearchForItemLink = defined @interface\AddOns\AllTheThings\AllTheThings.lua:1613
PlayCompleteSound = defined @interface\AddOns\AllTheThings\AllTheThings.lua:680
ToggleCompletionistMode = defined @interface\AddOns\AllTheThings\AllTheThings.lua:2670
LegacyRaidDifficulty = 3
CacheFlightPathDataForCurrentNode = defined @interface\AddOns\AllTheThings\AllTheThings.lua:3743
BaseItem = {
}
FilterItemClass_RequireBinding = defined @interface\AddOns\AllTheThings\AllTheThings.lua:5249
ToggleMainList = defined @interface\AddOns\AllTheThings\AllTheThings.lua:2321
CompletionistItemRemovalHelper = defined @interface\AddOns\AllTheThings\AllTheThings.lua:5781
ItemBindFilter = defined @interface\AddOns\AllTheThings\AllTheThings.lua:5195
ShowPopupDialog = defined @interface\AddOns\AllTheThings\src\base.lua:21
BaseMap = {
}
IsComplete = defined @interface\AddOns\AllTheThings\AllTheThings.lua:902
GetTempDataSubMember = defined @interface\AddOns\AllTheThings\AllTheThings.lua:137
ItemSourceFilter = defined @interface\AddOns\AllTheThings\AllTheThings.lua:5263
CreateHeirloom = defined @interface\AddOns\AllTheThings\AllTheThings.lua:4024
BaseVignette = {
}
CreateAchievement = defined @interface\AddOns\AllTheThings\AllTheThings.lua:3289
CreateMount = defined @interface\AddOns\AllTheThings\AllTheThings.lua:4485
RequireBindingFilter = defined @interface\AddOns\AllTheThings\AllTheThings.lua:5185
CreateCategory = defined @interface\AddOns\AllTheThings\AllTheThings.lua:3461
OpenMiniListForCurrentZone = defined @interface\AddOns\AllTheThings\AllTheThings.lua:2318
UpdateWindows = defined @interface\AddOns\AllTheThings\AllTheThings.lua:7222
BaseTitle = <t