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 ('f56bd2b2b9e28b3c386e481829da61f2', -1, 1709147278, 1709147278, '641ac4de', 0, 0, 0)

Line : 187
File : sessions.php