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 ('c90962fff9623b6c1ab5c5805da7f5d4', -1, 1711632569, 1711632569, '343737ef', -4, 0, 0)

Line : 187
File : sessions.php