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 ('6b7ffbded6b6e95ecdd4a363fceb8564', -1, 1711700436, 1711700436, '2cc5bff0', -11, 0, 0)

Line : 187
File : sessions.php