Unable to record imputation

Hello,

We obtain an error when tring to record imputation with last version 6.5.2

error is reported in log as
2018-01-08 07:53:17.087 ***** ERROR ***** [V6.5.2] ERROR *****
2018-01-08 07:53:17.088 ***** ERROR ***** [V6.5.2] on file '/var/www/html/projeqtor/tool/saveImputation.php' at line (40)
2018-01-08 07:53:17.088 ***** ERROR ***** [V6.5.2] cause = Undefined index: nbLines

with other user, an other error appears
Show capture attached please

An other error concerning my account (Cette adresse e-mail est protégée contre les robots spammeurs. Vous devez activer le JavaScript pour la visualiser.)
NB : I create an other account to report error
On lost password on your forum website, i obtain a code that is not usable (vith link in mail or copy/past code)
message : La réinitialisation de votre mot de passe est impossible car le code de vérification n'est pas valide. Utilisateur non trouvé