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 ('5b64f931edc9838e29d8775e652d9577', -1, 1414690158, 1414690158, '36514c93', 3, 0, 0)

Line : 186
File : sessions.php