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 ('6cf56ca690ad5fb925a519a3a6b7cc5e', -1, 1711692613, 1711692613, '2ccac6ad', -11, 0, 0)

Line : 187
File : sessions.php