Problem in virtuemart with a fatal error problem

[inviribus]

I've made an eshop but when someone is registered and he try to reach a subcategory he gets Fatal error

Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 5390 bytes) in /var/www/vhosts/gypsosanida-shop.gr/httpdocs/administrator/components/com_virtuemart/helpers/img2thumb.php on line 135

The eshop is http://www.gypsosanida-shop.gr nad the link for the category is http://gypsosanida-shop.gr/proionta/thermomonosi/eksoterikis-thermomonosis if you try to reach as normal anonymous user you didn't get the error but if you login as a customer and try to reach the subcategory and therefore try to make an order then you get the error did you have any solution about that???

The joomla is 2.5.14 and the virtuemart is VirtueMart 2.0.24 MINOR Revision: 7246 [IceBear]

Pleas advise

[Maxim Pishnyak]

Ask hoster to increase allowed memory size for your web shop.

[Milbo]

The file you upload is much too big. Approximatly 2 mb photo.