Section 8-314. Voting; primary election, missing enrollment record

If a
  registered voter marked an enrollment blank, but his  enrollment  as  so
  indicated  was not entered or entered incorrectly, he nevertheless shall
  be permitted to vote at the primary election, with the party under whose
  name he marked such blank, if he produces a certificate of the board  of
  elections  that he marked an enrollment blank, specifying the party, and
  that the entry of his enrollment on the  registration  poll  record  was
  omitted  or  incorrectly  entered  by  inadvertence or mistake and he is
  qualified to vote at the primary election in the party set forth in such
  certificate. In such a case the board  of  elections  shall  issue  such
  certificate  on  demand.  The  inspectors shall then and there enter the
  enrollment on the record.