What steps will reproduce the problem?
1.Using default blizzard Target but Pitbull4 Target's Target and Target of Target's Target
2. Enter into combat with nothing targeted
3.Get error message below and sometimes do not see the default blizzard target frame when I click on target but pitbull TT and ToTT show up

What is the expected output? What do you see instead?
Blizzard default Target Frame.  Nothing

What version of the product are you using?
beta 55

Do you have an error log of what happened?
Yes

Please provide any additional information below.
Date: 2015-04-01 21:54:23
ID: 1
Error occured in: AddOn: PitBull4_HideBlizzard
Count: 1
Message: Note: AddOn PitBull4_HideBlizzard attempted to call a protected function (TargetFrame:originalShow()) during combat lockdown.
Debug:
   [C]: originalShow()
   ..\FrameXML\FrameLocks.lua:91
      ..\FrameXML\FrameLocks.lua:69
   ..\FrameXML\FrameLocks.lua:104
      ..\FrameXML\FrameLocks.lua:97
   ..\FrameXML\FrameLocks.lua:126 Show()
   ..\FrameXML\TargetFrame.lua:110 TargetFrame_Update()
   ..\FrameXML\TargetFrame.lua:159 OnEvent()
   ..\FrameXML\UnitFrame.lua:676
      ..\FrameXML\UnitFrame.lua:674
   [C]: TurnOrActionStop()
   [string "TURNORACTION"]:4:
      [string "TURNORACTION"]:1

Also See

Date: 2015-04-01 21:54:23
ID: 2
Error occured in: AddOn: PitBull4_HideBlizzard
Count: 1
Message: Note: AddOn PitBull4_HideBlizzard attempted to call a protected function (TargetFrameToT:Show()) during combat lockdown.
Debug:
   [C]: Show()
   ..\FrameXML\TargetFrame.lua:957 TargetofTarget_Update()
   ..\FrameXML\TargetFrame.lua:114 TargetFrame_Update()
   ..\FrameXML\TargetFrame.lua:159 OnEvent()
   ..\FrameXML\UnitFrame.lua:676
      ..\FrameXML\UnitFrame.lua:674
   [C]: TurnOrActionStop()
   [string "TURNORACTION"]:4:
      [string "TURNORACTION"]:1

Plus:

Date: 2015-04-01 21:54:23
ID: 1
Error occured in: AddOn: PitBull4_HideBlizzard
Count: 1
Message: Note: AddOn PitBull4_HideBlizzard attempted to call a protected function (TargetFrame:originalShow()) during combat lockdown.
Debug:
   [C]: originalShow()
   ..\FrameXML\FrameLocks.lua:91
      ..\FrameXML\FrameLocks.lua:69
   ..\FrameXML\FrameLocks.lua:104
      ..\FrameXML\FrameLocks.lua:97
   ..\FrameXML\FrameLocks.lua:126 Show()
   ..\FrameXML\TargetFrame.lua:110 TargetFrame_Update()
   ..\FrameXML\TargetFrame.lua:159 OnEvent()
   ..\FrameXML\UnitFrame.lua:676
      ..\FrameXML\UnitFrame.lua:674
   [C]: TurnOrActionStop()
   [string "TURNORACTION"]:4:
      [string "TURNORACTION"]:1