I had the same issue. I replaced line 134 with these lines and it fixed it for me.
local classColor
if GetClassColor(unit) ~= nil then
classColor = "|cff".. GetClassColor(unit)
else
classColor = ""
end
local color = (UnitInParty(unit) or UnitInRaid(unit)) and classColor or "|cff00ff00"
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Installed long ago, but not used too much. Finally decided to actually use it ;).
r52858, fully updated standalone libraries. Error that appeared some time during a raid last night; a single count occurred:
"FuBar_CorkFu-2.0\\BuffTemplate.lua:134: attempt to concatenate a nil value"
You'll probably have to live with the errors on this one.