GitHub, a Microsoft subsidiary and internet host for software development, admitted to firing an employee in error who warned colleagues to be safe from “Nazis” at the Capitol siege and has offered the person his job back.

The incident began on Jan. 8 when the company fired an employee, who is Jewish and told his co-workers to stay safe from “Nazis” amid the influx of President Trump’s supporters to the nation’s capital, which offended another colleague. The firing was first reported by Business Insider.