diff --git a/tag-dropdown-widget.php b/tag-dropdown-widget.php
index 72b0286603b6a423ca684dd11beded2962d761dc..d037c1d1d8bfd7112a904794362f81bb169ff5a6 100644
--- a/tag-dropdown-widget.php
+++ b/tag-dropdown-widget.php
@@ -85,7 +85,7 @@ class taxonomy_dropdown_widget_plugin {
 		if ( 'option_defaults' == $var )
 			return $this->option_defaults;
 
-		return false;
+		return null;
 	}
 
 	/**