Usage: UnitThreatSituation("unit" [, "mob"]) Error

[Xrystal]

Just got this when my lowbie zoned into Rutheran Village from the boat coming from Azuremyst Isle. Could be a one off but will see if I see it happen under other circumstances as well.

Message: nUI-5.07.29 (Plus)\Units\nUI_UnitFeedback.lua:752: Usage: UnitThreatSituation("unit" [, "mob"])
Time: 12/01/12 05:07:15
Count: 1
Stack: Interface\AddOns\nUI\Units\nUI_UnitFeedback.lua:752: in function `updateFeedbackInfo'
Interface\AddOns\nUI\Units\nUI_UnitCache.lua:705: in function `getUnitInfo'
Interface\AddOns\nUI\Units\nUI_UnitHealth.lua:206: in function <Interface\AddOns\nUI\Units\nUI_UnitHealth.lua:192>

Locals: self = <table> {
 updateLevelFrame = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitLevel.lua:586
 refreshReadyCheckCallbacks = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitReadyCheck.lua:358
 unregisterClassCallback = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitClass.lua:500
 deletePortraitFrame = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitPortrait.lua:603
 unregisterUnitChangeCallback = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitChange.lua:304
 deleteLevelFrame = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitLevel.lua:562
 updateComboPointsFrame = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitComboPoints.lua:540
 registerCombatCallback = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitCombat.lua:190
 configFeedbackColor = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitFeedback.lua:570
 configCastBar = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitCasting.lua:414
 registerSpecCallback = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitSpec.lua:316
 refreshThreatCallbacks = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitThreat.lua:540
 registerPortraitCallback = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitPortrait.lua:278
 refreshComboPointsCallbacks = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitComboPoints.lua:321
 hideTooltip = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitFrame.lua:208
 getUnitInfo = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitCache.lua:673
 createRoleFrame = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitRole.lua:443
 refreshSpecCallbacks = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitSpec.lua:486
 deleteAuraFrame = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitAura.lua:1937
 deleteRangeFrame = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitRange.lua:789
 createPvPFrame = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitPvp.lua:436
 unregisterLabelCallback = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitLabel.lua:270
 refreshRestingCallbacks = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitResting.lua:300
 updatePvPFrame = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitPvp.lua:592
 createGCDFrame = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitGCD.lua:208
 configFeedback = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitFeedback.lua:555
 updatePortraitFrame = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitPortrait.lua:627
 configCasting = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitCasting.lua:395
 unregisterStatusCallback = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitStatus.lua:294
 registerRaidTargetCallback = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitRaidTarget.lua:213
 updateLabelInfo = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitLabel.lua:308
 createRunesFrame = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitRunes.lua:453
 deleteCombatFrame = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitCombat.lua:441
 configAura = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitAura.lua:1172
 unregisterGCDCallback = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitGCD.lua:195
 createLabelFrame = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitLabel.lua:364
 refreshRangeCallbacks = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitRange.lua:645
 registerComboPointsCallback = <function> defined @Interface\AddOns\nUI\Units\nUI_UnitComboPoints.lua:210