User ID missing in SESSION variable

Hi,
in mySQL database I have the user as: id, image, forname, surname ... and so on but as you can see here, the id is missing.
I have no idea why this is happening, and it seems to be replaced with ci_last_regenerate. Which is no use to me, since I am just trying to link the user to which comment they have left.

Please help!

Array ( [__ci_last_regenerate] => 1564423055 [image] => x;fdjdas;dfj; [forename] => John [surname] => Doe [email] => [email protected] [address] => Address [city] => City [county] => County [country] => Country [post_code] => Post Code [access_level] => 1 ) Blog ID:2Message: Hello