diff --git a/app/models/ask_setting.rb b/app/models/ask_setting.rb
index 1f65f6f..20698cb 100644
--- a/app/models/ask_setting.rb
+++ b/app/models/ask_setting.rb
@@ -160,7 +160,11 @@ class AskSetting
       ask_category_settings = AskCategorySetting.enabled.to_a
     end
     ask_category_settings.each do |c|
-      cat = Category.find(c.category_id)
+      cat = Category.find(c.category_id) rescue nil
+      if cat.nil?
+        c.destroy
+        next
+      end
       c.custom_fields.each do |k,v|
         trans = v["field"]
         tmp_locales.each do |l|