Errors when creating a Hikashop product page

I've created a single Hika product page and a menu link for it. When I publish this page, my entire site goes down and becomes inaccessible (ie. even the homepage is dead). I get this error:

Call to undefined function hikashop_config() in /my_url/components/com_hikashop/sef_ext.php on line 21

When I unpublish the page, my site works again. What's going on here?

Hi,

It seems to be a bug between HikaShop and sh404SEF with the new version of HikaShop that we released yesterday. We've published a new version which should fix the problem. Please download again from our website, install it over your current version and try again.

Thanks for the quick reply and the quick response. I've redownloaded and now the error is gone.