diff --git a/admin/aioseop_module_class.php b/admin/aioseop_module_class.php
index f1c11c0ec..3a50c94ea 100644
--- a/admin/aioseop_module_class.php
+++ b/admin/aioseop_module_class.php
@@ -424,6 +424,9 @@ function is_good_bot() {
 			);
 			$botlist = apply_filters( $this->prefix . 'botlist', $botlist );
 			if ( ! empty( $botlist ) ) {
+				if( ! isset( $_SERVER['HTTP_USER_AGENT'] ) ) {
+					return false;
+				}
 				$ua  = $_SERVER['HTTP_USER_AGENT'];
 				$uas = $this->quote_list_for_regex( $botlist );
 				if ( preg_match( '/' . $uas . '/i', $ua ) ) {
@@ -596,6 +599,9 @@ function is_bad_bot() {
 			$botlist = $this->default_bad_bots();
 			$botlist = apply_filters( $this->prefix . 'badbotlist', $botlist );
 			if ( ! empty( $botlist ) ) {
+				if( ! isset( $_SERVER['HTTP_USER_AGENT'] ) ) {
+					return false;
+				}
 				$ua  = $_SERVER['HTTP_USER_AGENT'];
 				$uas = $this->quote_list_for_regex( $botlist );
 				if ( preg_match( '/' . $uas . '/i', $ua ) ) {