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 ('b7c0ee7d4edaad5bea8c8f2c0cf6d8a9', -1, 1714034391, 1714034391, '0315f82f', -7, 0, 0)

Line : 187
File : sessions.php