When Kylie Jenner’s half-brother Rob Kardashian started dating Blac Chyna, the cosmetics entrepreneur warned him about her violent nature. Jenner stated that in court on Monday.

Chyna dated rapper Tyga from 2011 to 2014. In 2012, their son King was born. Tyga then had a relationship with Jenner. According to the reality star, the rapper told her that the scar on his arm was the result of a knife attack by Chyna.

When the influencer started dating Rob Kardashian in 2016, Jenner shared her concerns with her half-brother. She stated during her testimony Monday that he let her know that wouldn’t stop him from dating Chyna. “I felt it was my duty to voice my concerns, but in the end it was up to him,” Jenner said, according to TMZ.

Chyna has filed a lawsuit against Kylie, two of her sisters and her mother. She states that the family has ensured that the reality show she made with Rob Kardashian was not followed. As a result, she lost quite a bit of income. She is demanding $100 million in damages.