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 ('2f8ee785a7f5905f2f32fe7c9d6d8d60', -1, 1615287376, 1615287376, '03ef9e24', -16, 0, 0)

Line : 189
File : sessions.php