BBC Europe correspondent Katya Alder reportedly said during exit poll coverage on a show with colleague Huw Edwards that there was an "interesting atmosphere" amongs European officials attending an EU summit in Brussels.
EU officials were "supposed to be discussing Libya" but were instead "on their phone tyring to have a look at what the results are", Ms Alder said as quoted by The Express.
"Uncertainty" that was "damaging" for the UK was to blame, she said.
Ms Alder added: “I received a text message almost straight away from a politician in a country that is traditionally pretty close to the UK, saying this might mean saying goodbye to our British friends.
The BBC Europe correspondent added that it was not about voting Labour or Conservative, but "having a clear path forward and ending the uncertainty".
She said that despite UK prime minister Boris Johnson's "big win", he would lose his close relationship to the EU - the UK's largest trading partner.