Ammonite REPL predef for use with fs2

predef.scala

// Save as ~/.ammonite/predef.sc
// To use fs2 from ammonite repl, type `load.fs2` from repl prompt.
// You'll get all fs2 & cats imports, ContextShift and Timer instances
// for IO, and a globalBlocker

import $plugin.$ivy.`org.typelevel:::kind-projector:0.11.0`

if (!repl.compiler.settings.isScala213)
  repl.load.apply("interp.configureCompiler(_.settings.YpartialUnification.value = true)")

interp.configureCompiler(_.settings.Ydelambdafy.tryToSetColon(List("inline")))

object load {
  def fs2Version(version: String) = {
    repl.load.apply(s"""
      import $$ivy.`co.fs2::fs2-io:$version`, fs2._, fs2.concurrent._, cats._, cats.implicits._, cats.effect._, cats.effect.implicits._, scala.concurrent.duration._

      implicit val ioContextShift: ContextShift[IO] = IO.contextShift(scala.concurrent.ExecutionContext.Implicits.global)
      implicit val ioTimer: Timer[IO] = IO.timer(scala.concurrent.ExecutionContext.Implicits.global)
    """)
    if (!version.startsWith("1")) repl.load.apply("""
      val globalBlocker: Blocker = cats.effect.Blocker.liftExecutionContext(scala.concurrent.ExecutionContext.Implicits.global)
    """)
  }

  def fs2 = fs2Version("2.0.1")
}

I get an error on line 8 occasionally with this predef.

java.lang.NullPointerException
  ammonite.repl.Repl$$anon$1.compiler(Repl.scala:105)
  ammonite.predef.predef$.<clinit>(predef.sc:8)