New FResult JS function generate errors.

FC_pregmod.html:281212 Error: <<set>>: bad evaluation: Cannot read property 'variables' of undefined
	<<set FResult($slaves[$i])>>
n @ FC_pregmod.html:281212

This is call from saPleaseYou.tw

Function use JS strict mode - I do not have any experience with it, and can't fix it in reasonable time.