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 ('6df7e5fe6bcec780d8c75e160a0b5eab', -1, 1713887446, 1713887446, '03936878', 2, 0, 0)

Line : 187
File : sessions.php