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I've got a `BehaviorSubject&lt;Int?&gt;`, but IntelliJ is insisting that I have to pass an Int to onNext

I am not an expert on RxJava but as far as I remamber you cannot pass null. I guess that this is why there is `@NotNull` annotation before `onNext` argument and this is why you have this problem.

If so then there is no workaround and Kotlin is just securing you during compilation time from runtime errors :wink:

<@U282LGMGR> RxJava does not support nullable types, use `Optional`

Generally if you are convinced that you want to pass sth nullable to sth that is annotated as not nullable you need to write a proxy method using java

in rxjava 1.x you could pass `null`, in rxjava 2.x you can't pass null through streams by design (i assume youre using 2.x)