ensure wizard exists before forcing redirect

lib/wizard.rb

@@ -182,6 +182,10 @@ class CustomWizard::Wizard
     PluginStore.get('custom_wizard', wizard_id)
   end
 
+  def self.exists?(wizard_id)
+    PluginStoreRow.exists?(plugin_name: 'custom_wizard', key: wizard_id)
+  end
+
   def self.create(user, wizard_id)
     CustomWizard::Wizard.new(user, self.find(wizard_id).to_h)
   end

plugin.rb

@@ -128,10 +128,12 @@ after_initialize do
           CustomWizard::Wizard.set_submission_redirect(current_user, wizard_id, request.referer)
         end
 
+        if CustomWizard::Wizard.exists?(wizard_id)
           redirect_to "/w/#{wizard_id.dasherize}"
         end
       end
     end
+  end
 
   add_to_serializer(:current_user, :redirect_to_wizard) { object.custom_fields['redirect_to_wizard'] }