diff --git a/app/assets/javascripts/discourse/app/components/discovery/navigation.hbs b/app/assets/javascripts/discourse/app/components/discovery/navigation.hbs
index 9535ebd0390..13fc6969c0a 100644
--- a/app/assets/javascripts/discourse/app/components/discovery/navigation.hbs
+++ b/app/assets/javascripts/discourse/app/components/discovery/navigation.hbs
@@ -1,4 +1,7 @@
-<AddCategoryTagClasses @category={{@category}} @tags={{array @tag.id}} />
+<AddCategoryTagClasses
+  @category={{@category}}
+  @tags={{if @tag (array @tag.id)}}
+/>
 
 {{#if @category}}
   <PluginOutlet