What steps will reproduce the problem?
1. When people leave the raid

What is the expected output? What do you see instead?
Posted under the error log

What version of the product are you using?
 v3.4.4

Do you have an error log of what happened?
Message: [string "return function(unit, unitOwner)..."]:2: bad argument #1 to 'sub' (string expected, got nil)
Time: 12/18/11 19:59:34
Count: 16
Stack: [C]: in function `sub'
[string "return function(unit, unitOwner)..."]:2: in function <[string "return function(unit, unitOwner)..."]:1>
Interface\AddOns\ShadowedUnitFrames\modules\tags.lua:118 in function `func'
Interface\AddOns\ShadowedUnitFrames\modules\tags.lua:157 in function `?'
...nterface\AddOns\ShadowedUnitFrames\modules\units.lua:18 in function `FullUpdate'
...nterface\AddOns\ShadowedUnitFrames\modules\units.lua:336 in function `?'
...nterface\AddOns\ShadowedUnitFrames\modules\units.lua:153 in function <...nterface\AddOns\ShadowedUnitFrames\modules\units.lua:150

Locals: (*temporary) = nil
(*temporary) = 0
(*temporary) = 4
(*temporary) = "string expected, got nil"

Please provide any additional information below.