Deprecated – Non-static method should not be called statically

I believe the display_main method of wc-customer-source.php (~line 119) should be declared static.

As per this issue I think you may be falling foul of not having debugging switched on. Just in case you weren’t sure how, you can do so by adding the following to your wp-config.php file:

define( 'WP_DEBUG', true );

The notices mentioned in that post still stand and I continue to patch the plugin after each update. Of course that isn’t a major drama but it would be nice not to have to do that 🙂

Hope this helps and thanks again for the plugin.