rob-swu

Looks like this was fixed as part of https://github.com/styled-components/styled-components/releases/tag/v5.3.7-fixed

@hikariNTU the pr part of the release https://github.com/styled-components/styled-components/pull/3957 fixes it so if process.env is not defined it won't crash. and they mentioned it was already fixed for v6 in https://github.com/styled-components/styled-components/pull/3907...