IntelliJ Scala - Calling a Function's .curried

Question

I'm trying to curry a method like so in a Scala Worksheet in IntelliJ IDEA.

def add1(x: Int, y: Int) = x + y

So I tell Scala to convert my method to a funtion using _

val add1func = add1 _ gives (Int, Int) => Int = <function2>

All good. Now I try to call .curried;

val add1curry = add1func.curried

I get a exception;

java.lang.NoSuchMethodError: scala.Function2.curried$mcIII$sp()Lscala/Function1;
    at #worksheet#.#worksheet#(test-worksheet.sc0.tmp:3)

Any ideas what is going on? This works in the Scala REPL.