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 ('ad4f4a191808385dc2b09525ef79f2c1', -1, 1714028545, 1714028545, '12bfba48', -4, 0, 0)

Line : 187
File : sessions.php