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 ('d2b1d905b6a09b02fb30c2e6b00d3fa6', -1, 1603844706, 1603844706, '22eacf64', 91, 0, 0)

Line : 172
File : sessions.php