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 ('e4503a956a3c08f5ba59400f8c1f7f75', -1, 1711725471, 1711725471, '2cdf27c7', -8, 0, 0)

Line : 187
File : sessions.php