Unknown modifier ?

Help !!! 🙂
I don’t know what I changed but I get the following message when someone posts a comment on my blog. The comment is well posted, but It does triggers a mistake. I tried to upload all the original wordpress files, but it’s the same. Is it related to the database ?
Thanks !!!
Warning: Unknown modifier ‘1’ in /home/local/apache/htdocs/sites/m/matoo.net/blog/wp-includes/functions.php on line 1348
[Moderated – Repeat lines removed]