Warning message since update

Hi,
I’ve updated polylang recently, it has sovled some of my problems, thanks a lot ! But it begins to show up these warning messages below. I’ve tried to closed all the plug-ins update all the plugins and wordpress. Nothing works. I’ve serched in the forum, these kind of message showed up several years ago, but apparently, you’ve solved these in the recenty version. Could you please help ?

Thanks a lot !!

Warning: md5() expects parameter 1 to be string, array given in /home/tastya8/public_html/wp-content/plugins/polylang/admin/admin-strings.php on line 41

Warning: md5() expects parameter 1 to be string, array given in /home/tastya8/public_html/wp-content/plugins/polylang/admin/admin-strings.php on line 41

Warning: Cannot modify header information – headers already sent by (output started at /home/tastya8/public_html/wp-content/plugins/polylang/admin/admin-strings.php:41) in /home/tastya8/public_html/wp-includes/pluggable.php on line 1174

Lu