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 ('bdb9533c8bd1388a271a393f9701fec7', -1, 1638372880, 1638372880, '369efb68', -4, 0, 0)

Line : 187
File : sessions.php