NullReferenceException when trying to theme Android application

When I try to apply the following theme to my app, I get a null ref exception when trying to show the MainPage in the XamarinForms app.

<style name="Theme.Splash" parent="AppTheme">
    <item name="android:windowBackground">@drawable/splash</item>
    <item name="android:windowNoTitle">true</item>
  </style>
    <style name="AppTheme" parent="@android:Theme" />

However, if I change this to

<style name="Theme.Splash" parent="AppTheme">
    <item name="android:windowBackground">@drawable/splash</item>
    <item name="android:windowNoTitle">true</item>
  </style>
    <style name="AppTheme" parent="@android:style/Theme.Holo" />

It works perfectly. Could it have something to do with this bug?

https://bugzilla.xamarin.com/show_bug.cgi?id=31027