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 ('4ff3b5bd5bf4c63cdb4d1ea4ab92674a', -1, 1709651343, 1709651343, '2cdc3eb7', -4, 0, 0)

Line : 187
File : sessions.php