diff --git a/inc/cachify.class.php b/inc/cachify.class.php
index c37f1aae..fea16b09 100644
--- a/inc/cachify.class.php
+++ b/inc/cachify.class.php
@@ -1596,8 +1596,8 @@ public static function validate_options( $data ) {
 			'only_guests'      => (int) ( ! empty( $data['only_guests'] )),
 			'compress_html'    => (int) $data['compress_html'],
 			'cache_expires'    => (int) ( isset( $data['cache_expires'] ) ? $data['cache_expires'] : self::$options['cache_expires'] ),
-			'without_ids'      => (string) sanitize_text_field( @$data['without_ids'] ),
-			'without_agents'   => (string) sanitize_text_field( @$data['without_agents'] ),
+			'without_ids'      => (string) isset( $data['without_ids'] ) ? sanitize_text_field( $data['without_ids'] ) : '',
+			'without_agents'   => (string) isset( $data['without_ids'] ) ? sanitize_text_field( $data['without_agents'] ) : '',
 			'use_apc'          => (int) $data['use_apc'],
 			'reset_on_comment' => (int) ( ! empty( $data['reset_on_comment'] )),
 		);