“Fatal error”

This is the message that comes up, when I try to create a new product or trying to do something…
And this came AFTER the newest update.

Fatal error: Uncaught Error: Call to a member function get_facebook_id() on null in /var/www/snorri.dk/public_html/wp-content/plugins/facebook-for-woocommerce/facebook-commerce.php:3575 Stack trace: #0 /var/www/snorri.dk/public_html/wp-content/plugins/facebook-for-woocommerce/facebook-commerce.php(3425): WC_Facebookcommerce_Integration->get_product_fbid('fb_product_grou...', 4732) #1 /var/www/snorri.dk/public_html/wp-content/plugins/facebook-for-woocommerce/facebook-commerce.php(1062): WC_Facebookcommerce_Integration->delete_product_group(4732) #2 /var/www/snorri.dk/public_html/wp-content/plugins/facebook-for-woocommerce/facebook-commerce.php(1021): WC_Facebookcommerce_Integration->delete_fb_product(Object(WC_Product_Variable)) #3 /var/www/snorri.dk/public_html/wp-includes/class-wp-hook.php(307): WC_Facebookcommerce_Integration->on_product_delete(4732) #4 /var/www/snorri.dk/public_html/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array) #5 /var/www/snorri.dk/public_html/wp-includes/plugin.php(476): WP_ in /var/www/snorri.dk/public_html/wp-content/plugins/facebook-for-woocommerce/facebook-commerce.php on line 3575
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