Of course, because your `value2` has the type `Int...

# android

[r4zzz4k]

Of course, because your value2 has the type Int, not Int?, so null is not a valid value. You should go through the basics of the language, probably Kotlin Koans (https://kotlinlang.org/docs/tutorials/koans.html) are a good place to start. That will help you to proceed to more complex things.