phpBB : Fatale Fout

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 ('e7bc2a975d84dec3edefbbf0344e7078', -1, 1414194655, 1414194655, '365b2382', 3, 0, 0)

Line : 186
File : sessions.php