diff --git a/Tranga/MangaConnectors/Mangasee.cs b/Tranga/MangaConnectors/Mangasee.cs
index c05d8be..5d45ac6 100644
--- a/Tranga/MangaConnectors/Mangasee.cs
+++ b/Tranga/MangaConnectors/Mangasee.cs
@@ -196,7 +196,7 @@ public class Mangasee : MangaConnector
             {
                 string url = chapter.Descendants("link").First().Value;
                 Match m = chVolRex.Match(url);
-                string volumeNumber = m.Groups[2].Success ? m.Groups[2].Value : "0";
+                string? volumeNumber = m.Groups[2].Success ? m.Groups[2].Value : null;
                 string chapterNumber = m.Groups[1].Value;
 
                 url = string.Concat(Regex.Match(url, @"(.*)-page-[0-9]+(\.html)").Groups.Values.Select(v => v.Value));