diff --git a/lib/redmine_dmsf/webdav/base_resource.rb b/lib/redmine_dmsf/webdav/base_resource.rb
index 3395fbed..adc120f6 100644
--- a/lib/redmine_dmsf/webdav/base_resource.rb
+++ b/lib/redmine_dmsf/webdav/base_resource.rb
@@ -30,6 +30,7 @@ module RedmineDmsf
       attr_reader :public_path
 
       def initialize(path, request, response, options)
+        raise NotFound if Setting.plugin_redmine_dmsf['dmsf_webdav'].blank?
         @project = nil
         @public_path = "#{options[:root_uri_path]}#{path}"
         super(path, request, response, options)