phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO cantautore_phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin, is_robot) VALUES ('3ec5b550935c17877429bd82bb5b186f', -1, 1711702816, 1711702816, '03daf79f', -1415, 0, '0', '0')

Line : 175
File : sessions.php