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 ('dc4ad6d07bda8c1005a135d3c3968969', -1, 1635212060, 1635212060, '035003c0', -10, 0, 0)

Line : 187
File : sessions.php