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 ('4755645299b3b97aa70b1ed30d36c2af', -1, 1713872601, 1713872601, '0315f82f', -7, 0, 0)

Line : 187
File : sessions.php