New York (CNN Business) Add Christian Dior to the growing list of Western brands tangling with China.

The French fashion house issued an apology Thursday over a map of China used during a presentation that didn't include Taiwan. The small island is a self-ruled democracy that Beijing insists be treated as part of its "one China" initiative.

The message posted on Dior's verified Weibo account said it was an employee's fault, and that it supports China's "sovereignty and territorial integrity." It also wrote that it will investigate the incident, which happened Wednesday at a university in China.

China is one of the world's biggest markets for luxury goods, and Chinese shoppers at home and abroad make up almost a third of purchases globally, according to McKinsey. Shoppers in Asia (excluding Japan) account for nearly a third of Dior's revenue in 2018 — the most of any region.

LVMH LVMHF Dior is owned by luxury conglomerate, which also operates Louis Vuitton and Hennessy. The company didn't immediately reply to CNN Business' request for comment.