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 ('42da53d5fafa5baa4e1b1f24c93d0116', -1, 1709323660, 1709323660, '641ac4de', -4, 0, 0)

Line : 187
File : sessions.php