installed plugin Easy Digital Downloads version 3.1.0.3

wp-content/plugins/easy-digital-downloads/includes/interface-edd-exception.php

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+<?php
+/**
+ * Marker interface for all EDD exceptions
+ *
+ * @package     EDD
+ * @subpackage  Interfaces/Utilities
+ * @copyright   Copyright (c) 2018, Easy Digital Downloads, LLC
+ * @license     http://opensource.org/licenses/gpl-2.0.php GNU Public License
+ * @since       3.0
+ */
+
+/**
+ * EDD_Exception interface.
+ *
+ * This marker interface is used to make catching a variety of EDD-defined
+ * exceptions simpler.
+ *
+ * @since 3.0
+ */
+interface EDD_Exception {}