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 ('0cc2216777fb1c62d2d1f7030f912b4b', -1, 1714614200, 1714614200, '12df7711', 1, 0, 0)

Line : 187
File : sessions.php