[cyleigh]

Thank you!

Edit: This doesn't actually solve my problem.. because I still want strip some info from the meta data of the line. I have:

set myIncoming to (incoming lines of vertex)
		
set myCount to count of myIncoming
if (myCount is equal to 0) then
	set pathPrefix to stackLib's push({vertex, missing value},pathPrefix)
	copy pathPrefix to beginning of completedPaths
	set pathPrefix to stackLib's pop(pathPrefix)
else
	repeat with currentLink in myIncoming
		set pathPrefix to stackLib's push({vertex, currentLink}, pathPrefix)
		if ((source of currentLink) is not missing value) then
			set src to source of currentLink
			dft(src)
		else
			copy pathPrefix to beginning of completedPaths
			set pathPrefix to stackLib's pop(pathPrefix)
		end if
		set pathPrefix to stackLib's pop(pathPrefix)
	end repeat
end if

When there is no source I just get a message from saying "No result was returned from some part of this expression" when executing the "if source is missing value" part.