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 ('d50b240b0c4bec6ae19c42f2677f4592', -1, 1714002981, 1714002981, '340e79f2', -7, 0, 0)

Line : 187
File : sessions.php