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 ('278a02f0053c75c45c63af76c714224a', -1, 1711698341, 1711698341, '2cd2f01f', -11, 0, 0)

Line : 187
File : sessions.php