Searching product error

I get this error when searching for product:
http://yogi-bear-demo.digitalmarket.co.il/?s=נוטרו&x=18&y=21

Fatal error: Call to a member function is_on_sale() on a non-object in /home/digitalm/sites/yogi-bear-demo/wp-content/plugins/woocommerce/templates/single-product/sale-flash.php on line 15

Any help?
I’ve tried removing the if statement from sale-flash.php and the error won’t show up, but every product has a sale-flash alert…

Any suggestions?

Thank you

http://wordpress.org/plugins/woocommerce/