Server internal error with Register module

Tried to use LDAP Register module and got this error

Dec  4 16:26:31 llng-site LLNG[40694]: User not authenticated, Try in use, cancel redirection
Dec  4 16:26:31 llng-site LLNG[40694]: Start routing register
Dec  4 16:26:31 llng-site LLNG[40694]: Prepare captcha
Dec  4 16:26:31 llng-site LLNG[40694]: First access to register form
Dec  4 16:26:31 llng-site LLNG[40694]: Starting HTML generation using /usr/share/lemonldap-ng/portal/templates/bootstrap/register.tpl
Dec  4 16:26:31 llng-site LLNG[40694]: Sending /usr/share/lemonldap-ng/portal/templates/bootstrap/register.tpl
Dec  4 16:26:47 llng-site LLNG[40697]: User not authenticated, Try in use, cancel redirection
Dec  4 16:26:47 llng-site LLNG[40697]: Start routing register
Dec  4 16:26:47 llng-site LLNG[40697]: Good captcha response
Dec  4 16:26:47 llng-site LLNG[40697]: Captcha code verified
Dec  4 16:26:47 llng-site LLNG[40697]: No register_token
Dec  4 16:26:47 llng-site LLNG[40697]: Register session found: 1512332807_4879
Dec  4 16:26:47 llng-site LLNG[40697]: Try to get SSO session 1512332807_4879
Dec  4 16:26:47 llng-site LLNG[40697]: Session cannot be tied: Invalid session ID: 1512332807_4879 at /usr/share/perl5/Apache/Session/Generate/MD5.pm line 42, <F> line 4.
Dec  4 16:26:47 llng-site LLNG[40697]: Register expiration timestamp: 3600
Dec  4 16:26:47 llng-site LLNG[40697]: Register start timestamp: 1512401207
Dec  4 16:26:47 llng-site LLNG[40697]: Skin bootstrap selected from GET/POST parameter