Can you check your webserver logs to see if there is a full stack trace to see where it is being called from?
Is there more to the error message than just the file and line number?
Sorry I didnt realise I cut some off.
The full error is
[19-Oct-2017 08:33:16 UTC] PHP Warning: array_filter() expects parameter 1 to be array, null given in /home/handmad6/public_html/wp-content/plugins/woocommerce/includes/wc-notice-functions.php on line 137
This is all that shows in the log also.
This is an interesting one because there’s almost nothing this plugin can do to cause that error. We do add and occasionally delete WooCommerce notices but not in a way that should be leaving it in that state.
Do you have other WooCommerce related plugins installed that could be interacting with the notices in a way that only causes the issue to come out?
I would recommend clearing all the WooCommerce sessions and seeing if that solves the issue. The notices are saved per session/user.
