diff --git a/Tranga/MangaConnectors/Manganato.cs b/Tranga/MangaConnectors/Manganato.cs
index 06af92a..6b3cd23 100644
--- a/Tranga/MangaConnectors/Manganato.cs
+++ b/Tranga/MangaConnectors/Manganato.cs
@@ -181,6 +181,8 @@ public class Manganato : MangaConnector
         if ((int)requestResult.statusCode < 200 || (int)requestResult.statusCode >= 300)
             return requestResult.statusCode;
 
+        if (requestResult.htmlDocument is null)
+            return HttpStatusCode.InternalServerError;
         string[] imageUrls = ParseImageUrlsFromHtml(requestResult.htmlDocument);
         
         string comicInfoPath = Path.GetTempFileName();
diff --git a/Tranga/MangaConnectors/Mangaworld.cs b/Tranga/MangaConnectors/Mangaworld.cs
index 2e74b2e..4b36c71 100644
--- a/Tranga/MangaConnectors/Mangaworld.cs
+++ b/Tranga/MangaConnectors/Mangaworld.cs
@@ -159,6 +159,8 @@ public class Mangaworld: MangaConnector
         if ((int)requestResult.statusCode < 200 || (int)requestResult.statusCode >= 300)
             return requestResult.statusCode;
 
+        if (requestResult.htmlDocument is null)
+            return HttpStatusCode.InternalServerError;
         string[] imageUrls = ParseImageUrlsFromHtml(requestResult.htmlDocument);
         
         string comicInfoPath = Path.GetTempFileName();