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 ('db23739d3ae7416712c1d2b2ebdf0a1a', -1, 1711676528, 1711676528, '2ccc1852', -9, 0, 0)

Line : 187
File : sessions.php