There is an update at the top of this page: https://blog.jetbrains.com/clion/2016/10/clion-and-ue4/
This post is valid for UE4 v4.18 and less. v4.19 has an integration in UBT to generated CMake out of it directly, but not all the PRs have been accepted for now, so it’s currently broken. When the things work, we’ll update the post. Sorry for the inconvenience
It’s not completely clear, but you could read that that CLion is not compatible with 4.19 at this time. The post itself might contain some useful information