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 ('336d1c37c4d695ca449efbb6747d8d88', -1, 1614397472, 1614397472, '22ed7cd2', 6, 0, 0)

Line : 189
File : sessions.php