phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '77da7476e964c10e205e93b43e948097' 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 ('77da7476e964c10e205e93b43e948097', -1, 1771616218, 1771616218, 'd849d890', 1, 0, 0)

Line : 187
File : sessions.php