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 ('5e5f4e4c8e0f0bc2be78dd4b848e19b6', -1, 1635043204, 1635043204, '03ebb36f', -4, 0, 0)

Line : 187
File : sessions.php