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 ('5daee8644ec4cfa7c316188b7873604b', -1, 1638921219, 1638921219, '12d478c3', 0, 0, 0)

Line : 187
File : sessions.php