TeleTet : 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 ('106207f83be949562526ca9b3b0b4923', -1, 1414167995, 1414167995, '3652a62d', -1, 0, 0)

Line : 189
File : sessions.php