Database error after WP version update

Website has slowed down insanely after update to 4.1 withe my host telling me the following error is popping up hundreds of times:

WordPress database error Duplicate entry ‘0’ for key ‘PRIMARY’ for query INSERT INTO wp_wppa_session (
session,
timestamp,
user,
ip,
status,
data,
count
)
VALUES ( ‘902650050ca2b2a81b17d4e3a3dac0f5’, ‘1422644452’, ‘88.2.251.155’, ‘88.2.251.155’, ‘valid’, ”, ‘1’ ) made by require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), do_action(‘init’), call_user_func_array, wppa_session_start, wppa_create_session_entry

What can i do about it? Please help me understand the error and or how i can remedy it.

Thank you kindly