Variable products

I have created 3 variable products on my website in which 2 of the products have around 150-200 variations in the product but there is one product which has more than 400 variations in it. The products with 150-200 variations are loading fine on the frontend but the product with more than 400 variations is loading on the frontend and results in a white blank screen.
But if I switch to the default WordPress theme then the product loads fine on the frontend and I can see all the variations of the products in the frontend, so there is some issue in the theme which results in a white blank screen if the number of variations is then 200 or 250.