phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'dfd408c34748b874a6dd83c4453c3cef' 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 ('dfd408c34748b874a6dd83c4453c3cef', -1, 1762370782, 1762370782, 'd849d887', 9, 0, 0)

Line : 187
File : sessions.php