Memory message after Add An Additional Entry

-- HikaShop version -- : 2.3.5
-- Joomla version -- : 2.5.18
-- PHP version -- : 5.4.35
-- Error-message(debug-mod must be tuned on) -- : Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 130968 bytes) in /var/www/vhosts/icac.org.jm/subdomains/2015Conference/httpdocs/site/libraries/joomla/filter/input.php on line 298

After a user registers and fills in the first form, then clicks on "Add An Additional Entry" and fills in that other form, then click next, we get a blank page. When error reporting is on, we see where there is a Fatal error caused by not enough memory. However, we have made memory unlimited and still get the same error.

What could the problem be? Please help.

We did as indicated and found that it occurs when the calculation for an additional entry is to take place.

So if we fill in the Entry form for a single person, all is well. But adding another entry, wherein the calculation is x 2 that is where the problem exists. what do we need to adjust?

I think I resolved this issue. Maximum number of items in the cart was set to 1. I increased it. Thank you.