MSNBC had an awkward moment while trying to conduct a post-debate interview Sunday night, as reporter Kristen Welker appeared not to know she was live and told a Hillary Clinton aide what she would be asking her during their segment.

She then interrupted the guest, Jen Palmieri, when she heard a delayed prompt from the studio.

Ari Melber threw to Welker to speak with Palmieri, a flack for Hillary Clinton, but Welker was in mid-conversation with Palmieri and was telling her she would ask a question about Flint, Michigan, the site of Sunday night's debate, because of the water crisis there.

"And I'm going to ask you about Flint," Welker said.

"Kristen, go ahead, you're live," Melber said. "You know, we have Kristen Welker. We're looking at her. She couldn't quite hear me before. Can you hear me now? If you can, go ahead."

Welker appeared to be receiving a delayed signal. Finally, she began the interview.

"So Jen, your initial reaction to tonight's debate? Very fiery," Welker said.

"Very fiery. Also very substantive," Palmieri said. "I think it was probably the most substantive exchange that we've had. Also, there were a little bit of fireworks, but I think that it was useful because we think–"

Welker then cut over her when she apparently finally heard Melber's words about starting the interview.

"Ari, I can hear you," Welker said. "I'm here with communications director Jen Palmeri. Can you guys hear me back in the studio?"

"Yes, we're on a delay, but go ahead," Melber said.

"Can you guys hear what we're saying here?" Welker asked.

"Yes!" Melber said.

The interview started again, and Palmieri again mispronounced the word "substantive" as she praised the tenor of the debate.

MSNBC has had its share of awkward on-air moments recently. In Nevada last month, a reporter did a live segment from a shooting range but his voice was drowned out by gunfire.