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 ('0c1b9718a3a329c1566879c6b582494f', -1, 1711692660, 1711692660, '22e4d5b7', -7, 0, 0)

Line : 187
File : sessions.php