Error with method sort and todoable

[ghost]

Hi,

Thank you for your great plugin!
I got the following error with your plugin on my Redmine:

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ActionView::TemplateError (undefined method `sort' for nil:NilClass) on line #6 of vendor/plugins/redmine_todos_plugin/app/views/todos/_root_todos.html.erb:
 <% raise unless parent_object %>

     <ul class="todos root" id="<%= TodosController::UL_ID + 'root' %><%='not-editable' unless editable %>">
       <% for todo in todos.sort{|a,b| a.position <=> b.position} %>
           <%= render :partial => 'todos/todo_li', :locals => { :todo => todo, :editable => editable }%>
       <% end %>
     </ul>


    vendor/plugins/redmine_todos_plugin/app/views/todos/_root_todos.html.erb:6
    vendor/plugins/redmine_todos_plugin/app/views/todos/index.html.erb:19
    vendor/plugins/redmine_todos_plugin/app/controllers/todos_controller.rb:109:in `create'

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and

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ActionView::TemplateError (undefined method `todoable' for nil:NilClass) on line #5 of vendor/plugins/redmine_todos_plugin/app/views/todos/_new_todo.html.erb:
#New todo: partial for creating a new todo.
#requires:
#   todo : a new Todo object
  parent_object = todo.todoable
  raise unless parent_object

%>

    vendor/plugins/redmine_todos_plugin/app/views/todos/_new_todo.html.erb:5
    vendor/plugins/redmine_todos_plugin/app/views/mytodos/index.html.erb:11
    vendor/plugins/redmine_todos_plugin/app/controllers/todos_controller.rb:109:in `create'

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Could you please help me fix them?

Thanks and regards,