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 ('3c8e28e3c9e052e601cce92013b2d395', -1, 1711640774, 1711640774, '03ee3e77', -10, 0, 0)

Line : 187
File : sessions.php