Undefined variable: plugin_options

  • This happens often. Installed the plugin and visited the settings page. That’s it.

    PHP Notice: Undefined variable: plugin_options in /wp-content/plugins/wp-html-mail/includes/class-haet-mail.php on line 169
PHP Stack trace:
PHP   1. {main}() /wp-admin/options-general.php:0
PHP   2. require_once() /wp-admin/options-general.php:10
PHP   3. do_action() /wp-admin/admin.php:224
PHP   4. WP_Hook->do_action() /wp-includes/plugin.php:453
PHP   5. WP_Hook->apply_filters() /wp-includes/class-wp-hook.php:310
PHP   6. Haet_Mail->print_admin_page() /wp-includes/class-wp-hook.php:286
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