diff --git a/app/models/global_setting.rb b/app/models/global_setting.rb
index c9de7b2b280..b8ff9fdc184 100644
--- a/app/models/global_setting.rb
+++ b/app/models/global_setting.rb
@@ -52,7 +52,8 @@ class GlobalSetting
 
 
     def lookup(key,default)
-      resolve(@data[key], default)
+      var = @data[key]
+      resolve(var, var.nil? ? default : "")
     end