phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '6aaf2f2994491150dcc435d1d51540ab' for key 'PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('6aaf2f2994491150dcc435d1d51540ab', -1, 1777155548, 1777155548, 'd849d87a', -2, 0, 0)

Line : 187
File : sessions.php