update_last_login checks if last_login_on is defined

lib/authenticated_app/user_authentication.rb

@@ -154,15 +154,17 @@ module AuthenticatedApp
     # update last login date after successful authentication.
     #
     def update_last_login
+      return unless respond_to?(:last_login_on)
+
       new_date = fuzzy_date
-      unless self.last_login_on == new_date
-        if self.new_record?
+      return if last_login_on == new_date
+
+      if new_record?
         self.last_login_on = new_date
       else
         update_column(:last_login_on, new_date)
       end
     end
-    end
 
     protected