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 ('af7f07787465bbae7d6b9df1a1f80866', -1, 1713452900, 1713452900, '0395d620', -10, 0, 0)

Line : 187
File : sessions.php