What steps will reproduce the problem?
1. mouse over an item

What is the expected output? What do you see instead?
drops framerate

What version of the product are you using?
RatingBuster-1.6.0 (r315)

Do you have an error log of what happened?

Please provide any additional information below.
1x RatingBuster-1.6.0 (r315)\RatingBuster.lua:3748 attempt to call method 'GetEffectFromMastery' (a nil value)
RatingBuster-1.6.0 (r315)\RatingBuster.lua:4260 in function `StatSummary'
RatingBuster-1.6.0 (r315)\RatingBuster.lua:2624 in function `handler'
LibTipHooker-1.1-11:168: in function <...bTipHooker-1.1\LibTipHooker-1.1\LibTipHooker-1.1.lua:163
<in C code>: ?
...ns\Ara_Broker_Tradeskills\Ara_Broker_Tradeskills.lua:1400 in function `SetTradeSkillItem':
Blizzard_TradeSkillUI\Blizzard_TradeSkillUI.lua:829 in function <...dOns\Blizzard_TradeSkillUI\Blizzard_TradeSkillUI.lua:826
...ns\Ara_Broker_Tradeskills\Ara_Broker_Tradeskills.lua:1407 in function <...ns\Ara_Broker_Tradeskills\Ara_Broker_Tradeskills.lua:1405

Locals:
self = <table> {
 SetDefaultModuleLibraries = <function> @ Ace3\AceAddon-3.0\AceAddon-3.0.lua:383
 Enable = <function> @ Ace3\AceAddon-3.0\AceAddon-3.0.lua:315
 RegisterChatCommand = <function> @ Ace3\AceConsole-3.0\AceConsole-3.0.lua:85
 EnableModule = <function> @ Ace3\AceAddon-3.0\AceAddon-3.0.lua:348
 modules = <table> {}
 GetModule = <function> @ Ace3\AceAddon-3.0\AceAddon-3.0.lua:231
 IterateEmbeds = <function> @ Ace3\AceAddon-3.0\AceAddon-3.0.lua:458
 defaultModuleLibraries = <table> {}
 GetStatMod = <function> @ RatingBuster\RatingBuster.lua:2152
 UnregisterChatCommand = <function> @ Ace3\AceConsole-3.0\AceConsole-3.0.lua:111
 MODIFIER_STATE_CHANGED = <function> @ RatingBuster\RatingBuster.lua:2259
 optionsFrames = <table> {}
 SplitDoJoin = <function> @ RatingBuster\RatingBuster.lua:2640
 Printf = <function> @ Ace3\AceConsole-3.0\AceConsole-3.0.lua:69
 OnProfileChanged = <function> @ RatingBuster\RatingBuster.lua:2170
 SetDefaultModulePrototype = <function> @ Ace3\AceAddon-3.0\AceAddon-3.0.lua:425
 OnProfileReset = <function> @ RatingBuster\RatingBuster.lua:2177
 OnInitialize = <function> @ RatingBuster\RatingBuster.lua:2197
 baseName = "RatingBuster"
 name = "RatingBuster"
 Bench = <function> @ RatingBuster\RatingBuster.lua:4452
 IsEnabled = <function> @ Ace3\AceAddon-3.0\AceAddon-3.0.lua:467
 orderedModules = <table> {}
 StatSummary = <function> @ RatingBuster\RatingBuster.lua:4057
 DisableModule = <function> @ Ace3\AceAddon-3.0\AceAddon-3.0.lua:366
 ProcessText = <function> @ RatingBuster\RatingBuster.lua:2661
 Disable = <function> @ Ace3\AceAddon-3.0\AceAddon-3.0.lua:330
 ADDON_LOADED = <function> @ RatingBuster\RatingBuster.lua:2274
 OnNewProfile = <function> @ RatingBuster\RatingBuster.lua:2187
 RegisterMessage = <function> @ Ace3\CallbackHandler-1.0\CallbackHandler-1.0.lua:118
 GetArgs = <function> @ Ace3\AceConsole-3.0\AceConsole-3.0.lua:144
 Print = <function> @ Ace3\AceConsole-3.0\AceConsole-3.0.lua:54
 ShowConfig = <function> @ RatingBuster\RatingBuster.lua:2104
 PLAYER_LEVEL_UP = <function> @ RatingBuster\RatingBuster.lua:2247
 OnDisable = <function> @ RatingBuster\RatingBuster.lua:2240
 OnEnable = <function> @ RatingBuster\RatingBuster.lua:2225
 IsModule = <function> @ Ace3\AceAddon-3.0\AceAddon-3.0.lua:484
 db = <table> {}
 SetDefaultModuleState = <function> @ Ace3\AceAddon-3.0\AceAddon-3.0.lua:403
 UNIT_AURA = <function> @ RatingBuster\RatingBuster.lua:2254
 ClearCache = <function> @ RatingBuster\RatingBuster.lua:2155
 SetEnabledState = <function> @ Ace3\AceAddon-3.0\AceAddon-3.0.lua:440
 SetupOptions = <function> @ RatingBuster\RatingBuster.lua:2075
 enabledState = true
 date = "2010-10-31"
 RegisterEvent = <function> @ Ace3\CallbackHandler-1.0\CallbackHandler-1.0.lua:118
 UnregisterAllMessages = <function> @ Ace3\CallbackHandler-1.0\CallbackHandler-1.0.lua:202
 version = "1.6.0 (r315)"
 UnregisterAllEvents = <function> @ Ace3\CallbackHandler-1.0\CallbackHandler-1.0.lua:202
 SendMessage = <function> @ Ace3\CallbackHandler-1.0\CallbackHandler-1.0.lua:87
 IterateModules = <function> @ Ace3\AceAddon-3.0\AceAddon-3.0.lua:453

  ---