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 ('c78d7557bf9ec32eda90760d0d1c1580', -1, 1711621380, 1711621380, '0351de98', 5, 0, 0)

Line : 187
File : sessions.php