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 ('6821183c2a34b02e57c4b3d1705fc5e6', -1, 1714039958, 1714039958, '0395d620', -4, 0, 0)

Line : 187
File : sessions.php