diff --git a/lib/model/shopSearchWord.model.php b/lib/model/shopSearchWord.model.php
index 8d9743a96..216316c89 100644
--- a/lib/model/shopSearchWord.model.php
+++ b/lib/model/shopSearchWord.model.php
@@ -15,7 +15,7 @@ public function getId($word)
             return self::$words_cache[$word];
         }
         if (mb_strlen($word) > 255) {
-            $word = mb_strlen($word, 0, 255);
+            $word = mb_substr($word, 0, 255);
         }
         $sql = "SELECT * FROM ".$this->table." WHERE name LIKE '".$this->escape($word, 'like')."'";
         $row = $this->query($sql)->fetch();
@@ -50,4 +50,4 @@ public function getIds($words, $by_part = 0)
         return array();
     }
 
-}
\ No newline at end of file
+}