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 ('59bc71d893e3afc9854e403f56f7af01', -1, 1711612548, 1711612548, '2cd324c7', -4, 0, 0)

Line : 187
File : sessions.php