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 ('7b35dd82767d4c6913209a38c6b84c95', -1, 1711701750, 1711701750, '035509d0', 0, 0, 0)

Line : 187
File : sessions.php