diff --git a/telethon_generator/data/errors.csv b/telethon_generator/data/errors.csv
index f016ba03..6e50f683 100644
--- a/telethon_generator/data/errors.csv
+++ b/telethon_generator/data/errors.csv
@@ -102,6 +102,7 @@ EMAIL_HASH_EXPIRED,400,The email hash expired and cannot be used to verify it
 EMAIL_INVALID,400,The given email is invalid
 EMAIL_UNCONFIRMED_X,400,"Email unconfirmed, the length of the code must be {code_length}"
 EMOJI_INVALID,400,
+EMOJI_NOT_MODIFIED,400,
 EMOTICON_EMPTY,400,The emoticon field cannot be empty
 EMOTICON_INVALID,400,The specified emoticon cannot be used or was not a emoticon
 EMOTICON_STICKERPACK_MISSING,400,The emoticon sticker pack you are trying to get is missing