Variations won’t work at all!

Ah, here it is. I need to be able to add variations in the tours, morning or afternoon, but when I add it, it breaks the site, next page either cart or checkout won’t load, page load spinner just keeps on spinning. When I take it out it works. But I need it, I don’t wanna set the site up with Morning tours in 1 section and Afternoon tours in another section, I want the option in booking. Can we find a fix for this please?