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 ('664ae8f9d8f57d92f10107b2f3a4ebbf', -1, 1714195040, 1714195040, '12dc01ef', -7, 0, 0)

Line : 187
File : sessions.php