Property of non-object in Functions/CheckLoginCookie.php on line 17

Can’t remember how to duplicate this issue, but it happens as a result of $UserDB not being an object. Fixed by replacing line 17:

Line 17:

$HashedDBPassword = $UserDB->User_Password;

Replace With:

$HashedDBPassword = (!empty($UserDB->User_Password)) ? $UserDB->User_Password : null;

Also replaced line 19 for good measure. Might not be necessary.

Line 19:

if ($HashedDBPassword == $HashedPassword) {

Replace With:

if (!is_null($HashedDBPassword) && $HashedDBPassword == $HashedPassword) {

https://www.ads-software.com/plugins/front-end-only-users/