add_action("wpdiscuz_before_wp_new_comment", function($commentdata){ if (!empty($commentdata["comment_author_email"]) && empty($commentdata["user_id"])) { $is_user_exist = get_user_by("email", sanitize_text_field($commentdata["comment_author_email"])); if ($is_user_exist) { wp_die(esc_html__("A user with this email is already registered! Please log in or use a different one!", "wpdiscuz")); } } });

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