diff --git a/telethon_generator/data/errors.csv b/telethon_generator/data/errors.csv
index b63cc8c6..0576b09f 100644
--- a/telethon_generator/data/errors.csv
+++ b/telethon_generator/data/errors.csv
@@ -378,6 +378,7 @@ WALLPAPER_FILE_INVALID,400,The given file cannot be used as a wallpaper
 WALLPAPER_INVALID,400,The input wallpaper was not valid
 WALLPAPER_MIME_INVALID,400,
 WC_CONVERT_URL_INVALID,400,WC convert URL invalid
+WEBDOCUMENT_MIME_INVALID,400,
 WEBDOCUMENT_URL_INVALID,400,The given URL cannot be used
 WEBPAGE_CURL_FAILED,400,Failure while fetching the webpage with cURL
 WEBPAGE_MEDIA_EMPTY,400,Webpage media empty