Users of Chinese microblogging website Weibo were left scratching their heads.
Kim Jong-un and Donald Trump shake hands in Singapore.
But it didn't take long for Twitter users to point out one glaring problem - there is no evidence to suggest the "proverb" was either ancient, or Chinese.
On Weibo, several people offered Chinese proverb suggestions that might convey something similar, without arriving at an agreement.
Meanwhile, US journalist Bill Kristol pointed out that the proverb could actually have originated in America.
"'Those who say it cannot be done, should not interrupt those doing it.' -Chinese Proverb", Ivanka posted on Monday, the night before her father and Kim came together to seek an end to a tense decadesold nuclear stand-off.
A Canadian journalist tweeted a response to Trump, writing, "I see this quote has variously been attributed to Confucius and George Bernard Shaw, so shall we split the difference and say it was Churchill?"
"One proverb from Ivanka has exhausted the brain cells of all Chinese internet users", a commenter admitted. "It seems in fact to be American from the turn of the 20th c. -which makes sense, since its spirit is can-do Americanism", he tweeted.
"But why are Trump WH (White House) aides giving our proverbs to China, increasing our proverb deficit?" he quipped.
A day later, even Ivanka Trump appeared to acknowledge the misattribution in a different tweet.
President's daughter attributes false quote to Chinese culture and baffles readers online as to its true origin.
And in March, a photo of Ms Trump donning a lab coat during a visit to a science centre was also mercilessly panned on social media, while in the same month clients threatened to boycott a salon which styled her hair before an event after the owner shared a snap of herself with the President's daughter at the hairdressers' salon.
Ivanka is a popular figure in China, with many young women there seeing her as a symbol of elegance following the success of her clothing label.