diff --git a/app/controllers/dmsf_controller.rb b/app/controllers/dmsf_controller.rb
index 1b93e691..09e348a0 100644
--- a/app/controllers/dmsf_controller.rb
+++ b/app/controllers/dmsf_controller.rb
@@ -442,13 +442,13 @@ class DmsfController < ApplicationController
       case node.type
       when 'folder'
         folder = DmsfFolder.find_by(id: node.id)
-        folder.delete true
+        folder&.delete true
       when 'file'
         file = DmsfFile.find_by(id: node.id)
-        file.delete true
+        file&.delete true
       when /link$/
         link = DmsfLink.find_by(id: node.id)
-        link.delete true
+        link&.delete true
       end
     end
     redirect_back_or_default trash_dmsf_path(id: @project.id)
diff --git a/init.rb b/init.rb
index e7ef2226..54230017 100644
--- a/init.rb
+++ b/init.rb
@@ -33,7 +33,7 @@ Redmine::Plugin.register :redmine_dmsf do
   end
   author 'Vít Jonáš / Daniel Munn / Karel Pičman'
   description 'Document Management System Features'
-  version '2.4.5'
+  version '2.4.6 devel'
   
   requires_redmine version_or_higher: '4.0.0'