[Plugin: WooCommerce] Warning: unexpected ','

Hi there,

I’m using the latest WP and WooCommerce version, and also the latest version of Enfold (theme).
At the cart, I get the following error:

Error found in: /home/michaelwijnands/public_html/klant/fernwood/wp-content/plugins/woocommerce/includes/shipping/flat-rate/includes/class-wc-eval-math.php, nfx, 145
Warning: unexpected ‘,’ in /home/michaelwijnands/public_html/klant/fernwood/wp-content/plugins/woocommerce/includes/shipping/flat-rate/includes/class-wc-eval-math.php on line 255

Edit: Just checked my Apache Error logs, it shows:
[Sat Jan 02 12:53:01 2016] [warn] [client 83.81.133.232] mod_fcgid: stderr: PHP Warning: unexpected ‘,’ in /home/michaelwijnands/public_html/klant/fernwood/wp-content/plugins/woocommerce/includes/shipping/flat-rate/includes/class-wc-eval-math.php on line 255, referer: http://michaelwijnands.nl/klant/fernwood/winkelmand/
[Sat Jan 02 12:54:56 2016] [warn] [client xx.xx.xx.xx] mod_fcgid: stderr: PHP Warning: unexpected ‘,’ in /home/michaelwijnands/public_html/klant/fernwood/wp-content/plugins/woocommerce/includes/shipping/flat-rate/includes/class-wc-eval-math.php on line 255

What’s this, and how to fix it?

Kind regards,
Michael