Vivint Solar’s chief executive officer was “deeply disturbed” last week by allegations of racism by a former employee in a California case.

According to the Washington Post, Teshawn Solomon filed a lawsuit against Vivint Solar June 11 in California Superior Court in Sacramento County, accusing his former employer of racial harassment and discrimination. The suit details incidents in 2017. Solomon was working as a Vivint Solar warehouse specialist in Sacramento when a supervisor referred to him using racist language, and other employees racially harassed him.

This was the first he’d heard of the incidents, David Bywater, Vivint Solar CEO, said in a statement released June 13.

“I want to firmly state that Vivint Solar has a zero-tolerance policy for racial discrimination and harassment in the workplace. Our company is built on the strength of diversity. The disturbing experience described by our former employee does not reflect the values or culture of Vivint Solar and stands in direct contradiction to our core values as a company,” Bywater continued.

Bywater detailed additional action the company has taken since the allegations became public, including doing its own internal investigation of the incidents. This resulted in the termination of one employee and discipline action against several others. Bywater and his executive team will also hire an independent third-party to review “company policies and procedures related to the issues raised by this incident,” and will make any recommended changes.

“We are committed to maintaining an environment where every employee and customer is valued, respected and treated with the dignity they deserve every day and with every interaction. We fell short in Sacramento. We can and we will do better,” Bywater concluded.