A bad update from Crowdstrike released on Friday caused a global IT outage, and it’s still impacting banks, healthcare providers, energy companies, and the US government.

Damon Bradley manages IT for the Applied Behavior Center for Autism in Fishers. He says the outage affected over 300 users at the company.

“From the time I got to work until I left, it was just crazy and chaotic,” Bradley says. “I had several calls about people who couldn’t get online and told me they had a blue screen.”

According to a post from CEO George Kurtz on X, CrowdStrike told customers early Friday that the outages were caused by a problem in one update of their software for Microsoft Windows.

Bradley says the company should thoroughly check the next update before sending it to millions of users.

“Test it out in a test environment before you release it to the public,” Bradley says. Companies often push these updates without rigorous testing, which adversely affects the end user.

The company confirmed that a security issue or cyberattack did not cause the outage. Airlines like Delta are still working to restore operations and canceling some flights, while restaurants, banks, and hospitals are also affected.