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 ('1433056b46a1f4aa6d0d9fc517d181ec', -1, 1730417078, 1730417078, '0389de1e', 13, 0, 0)

Line : 195
File : sessions.php