Added check to make sure user is signed in (#499)

app/helpers/theming_helper.rb

@@ -31,7 +31,7 @@ module ThemingHelper
 
   # Returns the user's provider in the settings context
   def user_settings_provider
-    if Rails.configuration.loadbalanced_configuration && !current_user&.has_role?(:super_admin)
+    if Rails.configuration.loadbalanced_configuration && current_user && !current_user&.has_role?(:super_admin)
       current_user.provider
     elsif Rails.configuration.loadbalanced_configuration
       @user_domain