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 ('3f168c47b932043a55ec6d043d23b7ad', -1, 1638848535, 1638848535, '36c68b70', -9, 0, 0)

Line : 187
File : sessions.php