diff --git a/Extension_CloudFlare_Plugin.php b/Extension_CloudFlare_Plugin.php
index 6ac74f28a..c57f5b969 100644
--- a/Extension_CloudFlare_Plugin.php
+++ b/Extension_CloudFlare_Plugin.php
@@ -479,9 +479,9 @@ private function ipv6_in_range( $ip, $range_ip ) {
 		$left_piece = $pieces[0];
 
 		// Extract out the main IP pieces.
-		$ip_pieces     = explode( '::', $left_piece, 2 );
+		$ip_pieces = explode('::', $left_piece, 2);
 		$main_ip_piece = $ip_pieces[0];
-		$last_ip_piece = $ip_pieces[1];
+		$last_ip_piece = isset($ip_pieces[1]) ? $ip_pieces[1] : '';
 
 		// Pad out the shorthand entries.
 		$main_ip_pieces = explode( ':', $main_ip_piece );