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 ('545d0e8c7ec9078a0e1fb84ab3f74c6a', -1, 1709601896, 1709601896, '2cd24d49', 0, 0, 0)

Line : 187
File : sessions.php