diff --git a/backend/app/Helper/StringHelper.php b/backend/app/Helper/StringHelper.php
index 635baaf2..ffa612c1 100644
--- a/backend/app/Helper/StringHelper.php
+++ b/backend/app/Helper/StringHelper.php
@@ -12,7 +12,7 @@ public static function previewFromHtml(string $text, int $length = 100): string
         $text = trim(preg_replace('/\s+/', ' ', $text));
 
         if (strlen($text) > $length) {
-            $text = substr($text, 0, $length - 3) . '...';
+            $text = mb_substr($text, 0, $length - 3) . '...';
         }
 
         return $text;