phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('4f2736d2b6dd7565430313463024f068', -1, 1412201889, 1412201889, '3650e7b1', 63, 0, 0)

Line : 180
File : sessions.php