When the Gravity Forms plugin is trying to send the e-mail notification we see quite often the following error:
Warning: extract() expects parameter 1 to be array, null given in /public_html/wp-content/plugins/wpmandrill/wpmandrill.php on line 1625
Maybe you check on the output of the ‘wp_filter’ first before passing in to the PHP extract function?
The extract function requires an array, but sometimes the ‘wp_mail’ filter returns ‘null’.
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