Unknown Error When Retrieving Items From Mail

[NeuroticPixels]

I've gotten this error every time I take attachments from my mail. It breaks my inventory UI (it will no longer update) and I'm forced to do a /reloadui.

It has also happened when looting a thieves trove. I can't easily pinpoint what addon is causing this issue, so I'm reaching out for help. Anyone have any good troubleshooting suggestions to help me narrow down the culprit?
I have many, many addons and I'm looking for something more than "disable them all, and then enable them 1 by 1 until you find the addon causing the issue". Because it would involve a lot more work than just that, since only certain actions (eg: retrieving mail attachments) causes the error.

EsoUI/Libraries/Globals/GlobalVars.lua:47: attempt to index a nil value stack traceback: EsoUI/Libraries/Globals/GlobalVars.lua:47: in function 'GetControl' |caaaaaa<Locals> suffix = "Flash" </Locals>|r EsoUI/Ingame/Inventory/Inventory.lua:1281: in function 'ZO_InventoryManager:PlayItemAddedAlert' |caaaaaa<Locals> self = tbl, filterData = tbl, tabFilters = tbl, filterKey = 1, tabFilter = tbl, filterIndex = 1 </Locals>|r EsoUI/Ingame/Inventory/Inventory.lua:1358: in function 'ZO_InventoryManager:OnInventoryItemAdded' |caaaaaa<Locals> self = tbl, inventoryType = 1, bagId = 1, slotIndex = 14, newSlotData = tbl, inventory = tbl </Locals>|r (tail call): ? (tail call): ? (tail call): ? EsoUI/Ingame/Inventory/Inventory.lua:680: in function 'callback' |caaaaaa<Locals> bagId = 1, slotIndex = 14, newSlotData = tbl, inventory = 1 </Locals>|r EsoUI/Libraries/Utility/ZO_CallbackObject.lua:111: in function 'ZO_CallbackObject:FireCallbacks' |caaaaaa<Locals> self = tbl, eventName = "SlotAdded", registry = tbl, callbackInfoIndex = 1, callbackInfo = tbl, callback = EsoUI/Ingame/Inventory/Inventory.lua:677, deleted = false </Locals>|r EsoUI/Ingame/Inventory/SharedInventory.lua:494: in function 'ZO_SharedInventoryManager:HandleSlotCreationOrUpdate' |caaaaaa<Locals> self = tbl, bagCache = tbl, bagId = 1, slotIndex = 14, isNewItem = true, slotData = tbl, result = 2 </Locals>|r EsoUI/Ingame/Inventory/SharedInventory.lua:267: in function 'ZO_SharedInventoryManager:RefreshSingleSlot' |caaaaaa<Locals> self = tbl, bagId = 1, slotIndex = 14, isNewItem = true, itemSoundCategory = 21, updateReason = 0, bagCache = tbl </Locals>|r EsoUI/Ingame/Inventory/SharedInventory.lua:56: in function 'RefreshSingle' EsoUI/Libraries/Refresh/Refresh.lua:65: in function 'ZO_Refresh:UpdateRefreshGroups' |caaaaaa<Locals> self = tbl, refreshGroup = "inventory", refreshData = tbl, _ = 1, singleData = tbl </Locals>|r EsoUI/Ingame/Inventory/SharedInventory.lua:93: in function 'OnInventorySlotUpdated' |caaaaaa<Locals> eventCode = 131223, bagId = 1, slotIndex = 14, isNewItem = true, itemSoundCategory = 21, updateReason = 0 </Locals>|r

I've gotten rid of a good amount of addons since this issue started occuring (last week? I think?). I couldn't find a txt document that contained all my enabled addons, but I've copied and pasted Addon Selector's saved variables into this spoiler:

Warning: Spoiler

["FCONotes"] = "FCO Notes|r",
["SmartLooter"] = "Smart Looter",
["FasterTravel"] = "Faster Travel",
["LibBinaryEncode"] = "LibBinaryEncode",
["LibCraftText"] = "LibCraftText",
["Junkee2018"] = "Junkee 2018",
["LootAlert"] = "Loot|rAlert!|r",
["LibLazyCrafting"] = "LibLazyCrafting v2.93",
["pChat"] = "pChat",
["ResourceRadar"] = "ResourceRadar",
["DolgubonsLazyWritCreator"] = "Dolgubon's Lazy Writ Creator v2.7.11.1",
["LibFilters-3.0"] = "LibFilters-3.0",
["Azurah"] = "Azurah|r",
["MM01Data"] = "Master Merchant Data File MM01Data",
["VampireWoe"] = "Vampire's Woe|r",
["HarvestMapNF"] = "HarvestMap-NoFaction-Zones",
["AutoInvite"] = "AutoInvite",
["FCOChangeStuff"] = "FCO ChangeStuff|r",
["LibMainMenu-2.0"] = "LibMainMenu-2.0",
["MM08Data"] = "Master Merchant Data File MM08Data",
["LibStub"] = "LibStub",
["LibGPS"] = "LibGPS",
["LostTreasure"] = "Lost Treasure|r",
["USPF"] = "Urich's Skill Point Finder",
["NoThankYou"] = "No, thank you!|r",
["TargetWhisper"] = "Target Whisper v1.0|r",
["MM15Data"] = "Master Merchant Data File MM15Data",
["FCOLockpicker"] = "FCO Lockpicker|r",
["VotansKeybinder"] = "Votan's Keybinder",
["CombatReticle"] = "Combat Reticle",
["MM02Data"] = "Master Merchant Data File MM02Data",
["PetKennel"] = "PetKennel 5.1.5",
["Alchemist"] = "Alchemist",
["WritWorthy"] = "WritWorthy 5.1.5",
["VotansImprovedQuests"] = "Votan's Improved Quests",
["GuildAdFilter"] = "GuildAdFilter",
["VotansAdvancedSettings"] = "Votan's Advanced Settings",
["CombatAlerts"] = "Code's Combat Alerts",
["IdleAnimations"] = "Idle|r Animations",
["RankNotifier"] = "GuildRankNotifier",
["NPCMuter"] = "NPCMuter",
["NTakLootSteal"] = "N'Tak'|r Loot'n'Steal",
["LibPhinixFunctions"] = "LibPhinixFunctions|r",
["EnchantedQuality"] = "Enchanted Quality",
["LoreBooks"] = "LoreBooks|r",
["ToxicPlayers"] = "ToxicPlayers",
["LibNotification"] = "LibNotification",
["LightsOfMeridia"] = "LightsOfMeridia",
["LibPrice"] = "LibPrice",
["CraftBagExtended"] = "Craft Bag Extended",
["FCOCraftFilter"] = "FCO CraftFilter|r",
["SpentSkillPoints"] = "SpentSkillPoints",
["VotansImprovedLocations"] = "Votan's Improved Locations",
["AF_CraftingMaterialLevelFilters"] = "Advanced Filters - Crafting Material Level Filters",
["MM13Data"] = "Master Merchant Data File MM13Data",
["VotanSearchBox"] = "Votan's Search Box",
["TamrielTradeCentre"] = "Tamriel Trade Centre",
["EasyMurderToggle"] = "EasyMurderToggle",
["PersonalAssistantBanking"] = "P|rersonalA|rssistant B|ranking",
["HarvestMapAD"] = "HarvestMap-AD-Zones",
["VotansGroupPins"] = "Votan's Group Pins",
["LibMotifCategories"] = "LibMotifCategories",
["Changes"] = "Changes8",
["ScootworksGroupLeader"] = "Scootworks|r Group Leader",
["PL_CombatIndicator"] = "PansyLabs Combat Indicator Addon",
["SlashCommands"] = "SlashCommands",
["LibSavedVars"] = "LibSavedVars",
["PersonalAssistantJunk"] = "P|rersonalA|rssistant J|runk",
["VotansAchievementsOvw"] = "Votan's Achievements Overview",
["JunkBuster"] = "Junk|rBuster",
["LibMapMetaData"] = "LibMapMetaData",
["NeatExperienceInfo"] = "Neat Experience Info",
["PersonalAssistant"] = "P|rersonalA|rssistant v2.4.11|r",
["QualitySort"] = "Quality Sort",
["MyStatus"] = "MyStatus",
["Destinations"] = "Destinations|r",
["MM14Data"] = "Master Merchant Data File MM14Data",
["DailyAlchemy"] = "Daily Alchemy|r",
["NTakCamera"] = "N'Tak'|r Camera",
["LibTextFilter"] = "LibTextFilter",
["SimpleDurability"] = "Simple Durability|r",
["LibResearch"] = "libResearch",
["AccountSettings"] = "Account|r Settings|r",
["HarvestMap"] = "HarvestMap",
["VotansAdaptiveSettings"] = "Votan's Adaptive (Video-)Settings",
["HarvensDurabilityAndCharges"] = "Harven's Durability and Charges",
["LibFoodDrinkBuff"] = "LibFoodDrinkBuff",
["CustomCompassPins"] = "CustomCompassPins",
["VotansMiniMap"] = "Votan's Minimap",
["MM03Data"] = "Master Merchant Data File MM03Data",
["LibMsgWin-1.0"] = "LibMsgWin-1.0",
["LibLootSummary"] = "LibLootSummary",
["VotansMapPinColors"] = "Votan's Map Pin Colors",
["NodeDetection"] = "NodeDetection",
["UndauntedPledgesUtilities"] = "Undaunted Pledges Utilities",
["LibZone"] = "LibZone",
["DryzlerElderGeekNetLore"] = "Dryzler's|r LoreBooks|r (Beta)",
["OfferedItems"] = "Offered Items|r",
["AudioControl"] = "ESO Audio Toggle|r",
["HarvestPins"] = "Harvest Pins",
["AdvancedFilters"] = "Advanced Filters",
["VotansSettingsMenu"] = "Votan's Settings Menu",
["LovelyEmotes"] = "LovelyEmotes",
["BeamMeUp"] = "BeamMeUp|r - Teleporter",
["Emacs"] = "Emacs",
["NoInteract"] = "No Interact",
["MM04Data"] = "Master Merchant Data File MM04Data",
["LibMediaProvider-1.0"] = "LibMediaProvider-1.0",
["SurveyTheWorld"] = "SurveyTheWorld",
["HarvensSubtitleAddon"] = "Harven's Subtitle Addon",
["DolgubonsLazySetCrafter"] = "Dolgubon's Lazy Set Crafter v2.1.3",
["SortByQuantity"] = "Sort By Quantity",
["DisableCustomTitles"] = "Disable Custom Titles",
["BloodyScreen"] = "Bloody Screen|r v0.3",
["LibFeedback"] = "LibFeedback",
["LibDebugLogger"] = "LibDebugLogger",
["HarvensAllExperienceBars"] = "Harven's All Experience Bars",
["TraitBuddy"] = "TraitBuddy|r",
["LibWorldMapInfoTab"] = "LibWorldMapInfoTab",
["BanditsUserInterface"] = "Bandits|r User Interface",
["SkyShards"] = "SkyShards|r",
["MM11Data"] = "Master Merchant Data File MM11Data",
["LibHarvensAddonSettings"] = "Harven's Addon Settings",
["AchievementInfo"] = "AchievementInfo",
["LibMapPins-1.0"] = "LibMapPins 1.0 r17",
["MM10Data"] = "Master Merchant Data File MM10Data",
["DungeonTracker"] = "Dungeon Tracker|r",
["GroupSynergizer"] = "Scorps Group Synergizer",
["LibSlashCommander"] = "LibSlashCommander",
["MM12Data"] = "Master Merchant Data File MM12Data",
["LibScootworksFunctions"] = "LibScootworksFunctions",
["ScootworksHUD"] = "Scootworks|r HUD",
["HarvestMapEP"] = "HarvestMap-EP-Zones",
["LibMapPing"] = "LibMapPing",
["Postmaster"] = "Postmaster",
["LibLoadedAddons"] = "LibLoadedAddons",
["LibSFUtils"] = "LibSFUtils",
["LibGetText"] = "LibGetText",
["AF_FCOItemSaverFilters"] = "Advanced Filters - FCO Item Saver Filters",
["GroupNotifications"] = "Group Notifications v1.0|r",
["oJ_ShowTraitOnList"] = "ShowTraitOnList|r 1.2.2",
["LibAddonMenu-2.0"] = "LibAddonMenu-2.0",
["PersonalAssistantLoot"] = "P|rersonalA|rssistant L|root",
["LibDateTime"] = "LibDateTime",
["LibMarify"] = "LibMarify",
["LibCustomMenu"] = "LibCustomMenu",
["MM07Data"] = "Master Merchant Data File MM07Data",
["LibPromises"] = "LibPromises",
["DeconJunkMarker"] = "Deconstruction Junk Marker",
["VotansFisherman"] = "Votan's Fisherman",
["DailyProvisioning"] = "Daily Provisioning",
["MapCoordinates"] = "Map Coordinates|r",
["LibDialog"] = "LibDialog",
["DisableAddonReminders"] = "Disable Addon Reminders",
["Clutch"] = "Clutch|r",
["LibRunebox"] = "LibRunebox",
["HarvensImprovedSkillsWindow"] = "Harven's Improved Skills Window",
["CraftStoreFixedAndImproved"] = "CraftStore",
["MapPins"] = "Map Pins|r",
["HarvensHouseHunter"] = "Harven's House Hunter",
["FriendRemovedNotification"] = "Friend Removed Notification v1.0|r",
["MM06Data"] = "Master Merchant Data File MM06Data",
["PersonalAssistantRepair"] = "P|rersonalA|rssistant R|repair",
["NTakDialog"] = "N'Tak'|r Dialog",
["MailBuddy"] = "MailBuddy|r",
["FCOItemSaver"] = "FCO ItemSaver|r",
["wykkydsToolbar"] = "Wykkyd Toolbar 3.2.5.0 |",
["MasterMerchant"] = "Master Merchant 2.2.0 by Philgo",
["AwesomeGuildStore"] = "AwesomeGuildStore",
["Lib2DArrow"] = "Lib2DArrow",
["LibAlchemyStation"] = "LibAlchemyStation",
["LibSets"] = "LibSets",
["Lib3D"] = "Lib3D-v3",
["AF_UnknownTraitFilters"] = "Advanced Filters - Unknown Trait Filters",
["CraftingMaterialLevelDisplay"] = "Crafting Material Level Display",
["HarvestMapDLC"] = "HarvestMap-DLC-Zones",
["LibExecutionQueue"] = "Lib Execution Queue",
["PersonalAssistantIntegration"] = "P|rersonalA|rssistant I|rntegration",
["HarvestMapDC"] = "HarvestMap-DC-Zones",
["VotansFishermanExport"] = "Votan's Fisherman Export",
["LibAsync"] = "LibAsync",
["MM09Data"] = "Master Merchant Data File MM09Data",
["DetailedResearchScrolls"] = "Detailed Research Scrolls",
["Joker"] = "Joker",
["libCommonInventoryFilters"] = "libCommonInventoryFilters",
["VotansRuneTooltips"] = "Votan's Rune Tooltips",
["WorldMapWayshrinesController"] = "World Map Wayshrines Controller",
["VotansAchievementFavorites"] = "Votan's Achievement Favorites",
["WishList"] = "Wish List",
["PotionMaker"] = "Potion Maker (for Alchemy Crafting)",
["MM00Data"] = "Master Merchant Data File MM00Data",
["MM05Data"] = "Master Merchant Data File MM05Data",
["VotansVisitedHouses"] = "Votan's Visited Houses",
["AddonSelector"] = "Addon Selector",
["libAddonKeybinds"] = "libAddonKeybinds",
["VotansImprovedMulticraft"] = "Votan's Improved Multicraft",
["InfoPanel"] = "Info Panel|r",

Thank you for any and all assistance. I really appreciate it.