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 ('784288c7272a923d29ec353984ae3124', -1, 1711719234, 1711719234, '36c69d0f', -4, 0, 0)

Line : 187
File : sessions.php