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 ('ef2dfccba000d0c6d3d36c368d6356a6', -1, 1730417763, 1730417763, '0389a445', -1280, 0, 0)

Line : 195
File : sessions.php