diff --git a/Sources/Subs.php b/Sources/Subs.php
index 8d62c4bb8b..2c8d9d9f13 100644
--- a/Sources/Subs.php
+++ b/Sources/Subs.php
@@ -3482,7 +3482,7 @@ function($matches) use ($schemes)
 		}
 
 		// Item codes are complicated buggers... they are implicit [li]s and can make [list]s!
-		if ($smileys !== false && $tag === null && isset($itemcodes[$message[$pos + 1]]) && $message[$pos + 2] == ']' && !isset($disabled['list']) && !isset($disabled['li']))
+		if ($smileys !== false && $tag === null && isset($itemcodes[$message[$pos + 1]], $message[$pos + 2]) && $message[$pos + 2] == ']' && !isset($disabled['list']) && !isset($disabled['li']))
 		{
 			if ($message[$pos + 1] == '0' && !in_array($message[$pos - 1], array(';', ' ', "\t", "\n", '>')))
 				continue;