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 ('a47ff26a5cd1de3a2eb5a55b475113ba', -1, 1709395338, 1709395338, '03ef0997', -1, 0, 0)

Line : 187
File : sessions.php