diff --git a/app/controllers/api/v1/navigations_controller.rb b/app/controllers/api/v1/navigations_controller.rb
index 7a10812a8..6cd4ef0d0 100644
--- a/app/controllers/api/v1/navigations_controller.rb
+++ b/app/controllers/api/v1/navigations_controller.rb
@@ -15,7 +15,7 @@ def transform(items)
     items.map do |item|
       r = {}
       r[:name] = item[:name]
-      r[:url] = request.base_url + item[:url] if item[:url] != '#'
+      r[:url] = request.base_url + item[:url] if item[:url] && item[:url] != '#'
       r[:items] = transform(item[:items]) if item[:items]
       r
     end