phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '171a6e5c609a40d4a909af136fd0d105' 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 ('171a6e5c609a40d4a909af136fd0d105', -1, 1770019365, 1770019365, 'd849d817', -4, 0, 0)

Line : 187
File : sessions.php