diff --git a/Bloxstrap/UI/Elements/Bootstrapper/CustomDialog.Creator.cs b/Bloxstrap/UI/Elements/Bootstrapper/CustomDialog.Creator.cs
index 9a339e0..d47e109 100644
--- a/Bloxstrap/UI/Elements/Bootstrapper/CustomDialog.Creator.cs
+++ b/Bloxstrap/UI/Elements/Bootstrapper/CustomDialog.Creator.cs
@@ -29,6 +29,7 @@ namespace Bloxstrap.UI.Elements.Bootstrapper
 
         private static Dictionary<string, HandleXmlElementDelegate> _elementHandlerMap = new Dictionary<string, HandleXmlElementDelegate>()
         {
+            ["BloxstrapCustomBootstrapper"] = HandleXmlElement_BloxstrapCustomBootstrapper_Fake,
             ["TitleBar"] = HandleXmlElement_TitleBar,
             ["Button"] = HandleXmlElement_Button,
             ["ProgressBar"] = HandleXmlElement_ProgressBar,
@@ -503,6 +504,12 @@ namespace Bloxstrap.UI.Elements.Bootstrapper
             return new DummyFrameworkElement();
         }
 
+        private static UIElement HandleXmlElement_BloxstrapCustomBootstrapper_Fake(CustomDialog dialog, XElement xmlElement)
+        {
+            // this only exists to error out the theme if someone tries to use two BloxstrapCustomBootstrappers
+            throw new Exception($"{xmlElement.Parent!.Name} cannot have a child of {xmlElement.Name}");
+        }
+
         private static DummyFrameworkElement HandleXmlElement_TitleBar(CustomDialog dialog, XElement xmlElement)
         {
             xmlElement.SetAttributeValue("Name", "TitleBar"); // prevent two titlebars from existing