Because wrapper version does not support 11+ you can make simple trick to cheat newer version of InteliJ forever.
press3x Shift -> type "Switch Boot JDK" -> and change for java 8.
https://blog.jetbrains.com/idea/2015/05/intellij-idea-14-1-4-eap-141-1192-is-available/
Or If you want to work with java 11+ you simply have to update wrapper version to 4.8+