phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '64186b83604a241ac2fed5fcd8381d61' for key 'phpbb_sessions.PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('64186b83604a241ac2fed5fcd8381d61', -1, 1762194628, 1762194628, 'd849d887', -9, 0, 0)

Line : 187
File : sessions.php