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 ('1ca1c9c0762be5f726dd97fa47af0e8e', -1, 1711749451, 1711749451, '36e034d2', 2, 0, 0)

Line : 187
File : sessions.php