String.find attempt to index al boolean value?

[Ecstacy]

Hey,

I'm having an error with this part of my script, it tells me I attempt to index a boolean value :s

Distro: 0.3.6pl1
Error:

[09/03/2011 20:27:20] [Error - Action Interface] 
[09/03/2011 20:27:20] data/actions/scripts/petdeed.lua:onUse
[09/03/2011 20:27:20] Description: 
[09/03/2011 20:27:20] data/lib/050-function.lua:250: attempt to index a boolean value
[09/03/2011 20:27:20] stack traceback:
[09/03/2011 20:27:20]     data/lib/050-function.lua:250: in function 'getItemSpecialDescription'
[09/03/2011 20:27:20]     data/actions/scripts/petdeed.lua:26: in function <data/actions/scripts/petdeed.lua:19>

[09/03/2011 20:27:22] [Error - Action Interface] 
[09/03/2011 20:27:22] data/actions/scripts/petdeed.lua:onUse
[09/03/2011 20:27:22] Description: 
[09/03/2011 20:27:22] (luaGetThing) Thing not found

Script part:

for i = 1,#m do
	if string.find(getItemSpecialDescription(itemEx.uid):lower(),m[i]:lower()) then
		a = i
	end
end
local monster = m[a]

 

[Cykotitan]

for i = 1,#m do
	if (getItemAttribute(itemEx.uid, 'description') or ''):lower():find(m[i]:lower()) then
		a = i
		break
	end
end
local monster = m[a]

 

[Ecstacy]

for i = 1,#m do
	if (getItemAttribute(itemEx.uid, 'description') or ''):lower():find(m[i]:lower()) then
		a = i
		break
	end
end
local monster = m[a]

Awesome, thank you