Call to a member function real_escape_string() on boolean

1. It probably means your database connection has failed (or was never attempted in the first place).
2. Stop using MD5. Especially for password hashing, use https://secure.php.net/password

Hello
Thanks a lot for your reply..
for 2, thanks will make the change

for 1, I understand that the database connection has failed.. which i could confirm by printing $this->conn in mysqli_driver.php file

but not sure why its failing only when there is string in where clause ??
I mean. everything works fine when I select on primary key....

Is it something to do with the sessions library ?? because when I investigated .. before my query a query to sessions table from session library was made.

Kindly help me with this one..

Thanks