A recurring bug in cgProfiler

-- Seems to be this function, only (npcs/npcs.lua)
function npcs:AddObjectInfo()
if GameTooltip:IsShown() then
for i=1,GameTooltip:NumLines() do
local temp = _G["GameTooltipTextLeft"..i]:GetText()
if ...

Seem to be getting tables passed to strlower() in cgProfiler/npcs.lua.
Thought I'd fixed a couple of cases by adding a type() test, but still seem to occur every so often.
Wonder if it's because of other addons...or does cgProfiler get ...