Date: 2018-07-21 08:58:14
ID: 36
Error occured in: Global
Count: 1
Message: ..\AddOns\bestride\Bestride_Logic.lua line 407:
Usage: UnitBuff("unit", [index][, "filter"])
Debug:
[C]: UnitBuff()
bestride\Bestride_Logic.lua:407: Swimming()
bestride\Bestride_Logic.lua:273: PreClick()
[string ":PreClick"]:1:
[string ":PreClick"]:1
[C]: Click()
..\FrameXML\ChatFrame.lua:1626: ?()
..\FrameXML\ChatFrame.lua:4695:
..\FrameXML\ChatFrame.lua:4662
[C]: ChatEdit_ParseText()
..\FrameXML\ChatFrame.lua:4383:
..\FrameXML\ChatFrame.lua:4382
[C]: ChatEdit_SendText()
..\FrameXML\ChatFrame.lua:2874:
..\FrameXML\ChatFrame.lua:2867
[C]: UseAction()
..\FrameXML\SecureTemplates.lua:345: handler()
..\FrameXML\SecureTemplates.lua:623:
..\FrameXML\SecureTemplates.lua:571
[C]: ?
..\FrameXML\SecureHandlers.lua:266:
..\FrameXML\SecureHandlers.lua:263
[C]: ?
..\FrameXML\SecureHandlers.lua:296:
..\FrameXML\SecureHandlers.lua:279
(tail call): ?
Locals:
(*temporary) = "player"
(*temporary) = "Water Breathing"

AddOns:
Swatter, v7.7.6000 (SwimmingSeadragon)
Altoholic, vr183
Archy, v7.3.2.1
Atlas, vv1.43.06
AtlasBurningCrusade, vv1.43.00
AtlasCataclysm, vv1.43.00
AtlasClassicWoW, vv1.43.00
AtlasLegion, vv1.43.03
AtlasMistsofPandaria, vv1.43.00
AtlasWarlordsofDraenor, vv1.43.00
AtlasWrathoftheLichKing, vv1.43.01
AtlasLoot, vv8.07.13
AtlasLootBurningCrusade, vv8.07.13
AtlasLootCataclysm, vv8.07.13
AtlasLootClassic, vv8.07.13
AtlasLootLegion, vv8.07.13
AtlasLootMistsofPandaria, vv8.07.13
AtlasLootWarlordsofDraenor, vv8.07.13
AtlasLootWrathoftheLichKing, vv8.07.13
AtlasMajorCitiesEnhanced, vv1.15
AucAdvanced, v7.7.6000 (SwimmingSeadragon)
AucFilterBasic, v7.7.6000 (SwimmingSeadragon)
AucStatHistogram, v7.7.6000 (SwimmingSeadragon)
AucStatiLevel, v7.7.6000 (SwimmingSeadragon)
AucStatPurchased, v7.7.6000 (SwimmingSeadragon)
AucStatSimple, v7.7.6000 (SwimmingSeadragon)
AucStatStdDev, v7.7.6000 (SwimmingSeadragon)
AucUtilFixAH, v7.7.6000 (SwimmingSeadragon)
Bartender4, v4.8.1
BeanCounter, v7.7.6000 (SwimmingSeadragon)
bestride, v0.0.4
CTBagMod, v
DataStore, vr64
DataStoreAchievements, vr46
DataStoreAgenda, vr26
DataStoreAuctions, vr49
DataStoreCharacters, vr41
DataStoreContainers, vr57
DataStoreCrafts, vr78
DataStoreCurrencies, vr36
DataStoreGarrisons, vr22
DataStoreInventory, vr51
DataStoreMails, vr50
DataStorePets, vr43
DataStoreQuests, vr43
DataStoreReputations, vr41
DataStoreSpells, vr31
DataStoreStats, vr30
DataStoreTalents, vr60
DBMCore, v8.0.0
DBMDefaultSkin, v
DBMStatusBarTimers, v
DejaCharacterStats, v800r103
EasyMail, v7.0
Enchantrix, v7.7.6000 (SwimmingSeadragon)
EnchantrixBarker, v7.7.6000 (SwimmingSeadragon)
ExecutiveAssistant, v1.3
ExtVendor, v1.7.2
FactionAddict, v1.48
GarrisonMissionManager, vv55
GatherMate2, v1.42
Grail, v095
HandyNotes, vv1.5.2
HandyNotesDraenorTreasures, v1.21
HandyNotesLegionRaresTreasures, v1.1
HandyNotesSuramarTelemancy, v1
IceHUD, v1.11.2
Informant, v7.7.6000 (SwimmingSeadragon)
MasterPlanA, vA
MouseTooltip, v1.0
MoveAnything, v17.0.0
nehFragger, v1.3a
NPCScan, v8.0.1.2
Omen, v3.2.0
OmniCC, v8.0.0
Overachiever, v1.0.0
PersonalLootHelper, v2.04
PetBattleMaster, v7.0.4
PetTracker, v7.3.0
PetTrackerBreeds, v7.3.0
PetTrackerConfig, v7.3.0
PetTrackerJournal, v7.3.0
PetTrackerSwitcher, v7.3.0
PetTrackerUpgrades, v7.3.0
Prat30, vr1155
Prat30Libraries, v
Quester, v8.0.1.0
Recount, vv8.0.1a
sct, v7.1
SlideBar, v7.7.6000 (SwimmingSeadragon)
Stubby, v7.7.6000 (SwimmingSeadragon)
TimerBars, v1.2
Titan, v5.13.1.70300
TitanBag, v5.13.1.70300
TitanClock, v5.13.1.70300
TitanGold, v5.13.1.70300
TitanGuild, v7.0.3.4
TitanLocation, v5.13.1.70300
TitanLootType, v5.13.1.70300
TitanMail, v7.35
TitanPerformance, v5.13.1.70300
TitanRepair, v5.13.1.70300
TitanSpeed, v7.3.001
TitanVolume, v5.13.1.70300
TitanXP, v5.13.1.70300
Wholly, v066
BlizRuntimeLib_enUS v8.0.1.80000
(ck=bde)

Going to need to treat water breathing buffs the same as Aquatic Form since you can't query UnitBuff() by name/ID any longer. That or step through all active buffs to look for it being active each time. Whichever floats your boat (no pun intended).

Pull Request with fix submitted