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 ('c88a20915f1967dc26243ed05952f87b', -1, 1711670341, 1711670341, '36addd84', -1, 0, 0)

Line : 187
File : sessions.php