Ajax is not defined Line 205

Been tweaking some php to suit my needs but may messed up something..
Everything works expect with options.
When an option is selected, the product get add to the card but not the option.

Have an Ajax error Line 205 "Ajax is not defined"


Can't figure it out

Any idea?

Cheers

PS : I have the same error even with "Use AJAX when possible
for add to cart buttons " set to "No"

Could you give a link to the page where you have the problem ?