We have resolved the issue identified earlier today. The issue may have occurred on websites using a Promise polyfill and which used the Promise functionality in their code base.

The full incident report regarding this can be found here:
https://help.hotjar.com/hc/en-us/articles/360036454593-26th-September-2019-Tracking-Code-interfering-with-websites

If you have any more issues, please contact support@hotjar.com.

We have deployed a fix for the issue and are monitoring it now. More details will be posted shortly.

We have detected an issue in the Hotjar script which may be affecting sites that rely on a Promise Polyfill. Our engineers have identified the cause and are working on a fix now.