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 ('2ced8b89f2c8b03c8ebb912d504192c1', -1, 1713552626, 1713552626, '0395fc25', 6, 0, 0)

Line : 187
File : sessions.php