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 ('a91d3eeabcb8450c6f00f04f05df9792', -1, 1713561255, 1713561255, '0d3bc376', 0, 0, 0)

Line : 187
File : sessions.php