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 ('2d86a7ed623755fb3a20d3ad0d4f8a84', -1, 1713950704, 1713950704, '0390bdb1', -4, 0, 0)

Line : 187
File : sessions.php