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 ('894bb5c8fd15b2111605c019f9ee0102', -1, 1711701206, 1711701206, '03ee54d5', 3, 0, 0)

Line : 187
File : sessions.php