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 ('579cf88ba439b6930501069e60e351d4', -1, 1711688989, 1711688989, '0351b8aa', -4, 0, 0)

Line : 187
File : sessions.php