Error with woocommerce

Hello,
I'm having a little trouble with the woocommerce integration on this website. When viewing the product above the price this error is appearing: Warning: array_sum() expects parameter 1 to be array, string given in /var/sites/f/faithworkstreasures.co.uk/public_html/wp-content/plugins/woocommerce/includes/abstracts/abstract-wc-product.php on line 1125

Any ideas?

Thanks!