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 ('50c5970c68db41c47181ded66a462e2d', -1, 1414217638, 1414217638, '365b09f8', 3, 0, 0)

Line : 186
File : sessions.php