The Electoral Commission is apologising for releasing screenshots that identified the person who took them to the team of a political candidate who is under investigation.
Maori Party candidate Wetex Kang's campaign is being investigated by the commission for allegedly offering online cash credits on Chinese social media app WeChat.
A spokeswoman for the commission said: "Screenshots were provided that inadvertently identified the person who made the screenshots, and we have apologised for this."
She said the commission does not identify individuals in relation to complaints and it is "regrettable" that this has occurred.
"Mr Kang has been informed that the person identified is not the person who made the complaint, and that the Commission has received queries about the same matter from more than one person," the spokeswoman said.