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 ('646a4dd5cde7404253f7a80e8155e20e', -1, 1711644818, 1711644818, '03e60117', -2, 0, 0)

Line : 187
File : sessions.php