CLONE -JAVA_HOME with Backslash at end results in Error JAVA_HOME not set

On my system I have JAVA_HOME set to "C:\JDK\"
This results in an error message when starting GROOVY:
"JAVA_HOME not set"

When I change JAVA_HOME to "C:\JDK" everything works fine.

This can be a litte disturbing for new users and should be easy to fix, I guess.

Greetings,
Malte