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 ('776d9596131c890dddad3aaf6ef2ebb3', -1, 1635419342, 1635419342, '22ecbf68', 14, 0, 0)

Line : 187
File : sessions.php