CNN and the Des Moines Register have scrapped the planned release of a key poll on the eve of the Iowa caucuses after concerns about an apparent technical error left one of the leading contenders out of at least one survey.

The media outlets decided to nix a planned live televised release of the survey after a supporter of former Mayorreceived a call from the pollsters — and Buttigieg’s name was not one of the options offered.

A source with knowledge of the decision said a computer monitor in the call center used to conduct the poll was set to show font at a larger-than-normal text. That setting cut off the name of the last candidate listed in the randomized order testing potential Democratic candidates. In the case of at least one voter, the Buttigieg supporter, the randomized order placed Buttigieg last — and so Buttigieg’s name was not mentioned.

“Nothing is more important to the Register and its polling partners than the integrity of the Iowa Poll. Today, a respondent raised an issue with the way the survey was administered, which could have compromised the results of the poll. It appears a candidate’s name was omitted in at least one interview in which the respondent was asked to name their preferred candidate,” wrote Carol Hunter, the Register’s executive editor.

Hunter wrote that the news partners were unable to confirm whether the omission of Buttigieg’s name happened during more than one interview.

Matt Dornic, a spokesman for CNN, confirmed the decision not to release the poll.

“We were unable to ascertain what happened during this respondent’s interview, and cannot determine if this was a single isolated incident,” Dornic said in a text. “CNN, The Des Moines Register and Selzer & Company aim to uphold the highest standards of survey research and therefore the partners decided not to proceed.”

The source with knowledge of the poll said the media partners were not able to determine how many interviews the call center employee had conducted, and how many could have been influenced by the final candidate’s name being cut off at the end. “It was simply impossible to know how many of the interviews could have been affected. Unless we are 100 percent confident in the data, we aren’t going to release the poll,” the source told The Hill.

No more public polls are expected before the Iowa caucuses, which begin at 7 p.m. local time on Monday.

Updated Feb. 2, 8:38 a.m.