Conditional Shipping and Payments for WooCommerce

A hosting client took down an entire server today because they had an extra “|” on the end of their shipping restrictions list in effect creating a blank entry.

The error in the logs was
PHP Warning: strpos(): Empty needle in /public_html/wp-content/plugins/woocommerce-conditional-shipping-and-payments/includes/restrictions/class-wc-csp-restrict-shipping-methods.php on line 712

This seemed to cause a CPU race condition and the client opening multiple orders at once in multiple tabs caused a 12-core server to stop responding.

The fix is to trim the array before processing so the needle is not empty – or clean the input on save.

Thanks!