Bug? Haml + handlebars. .something{:class => "{{#if something}}something{{/if}}"}

[Иван Горшков]

Hello. Help, I can not understand why do not work.

.comments{:class => "{{#if states.hiddenComments}}hidden{{/if}}"} -> <div class='comments states.hiddenComments}}hidden{{/if}} {{#if'> - error

%div{class: "comments {{#if states.hiddenComments}}hidden{{/if}}"} -> <div class='comments {{#if states.hiddenComments}}hidden{{/if}}'> - good

I will be grateful for the help.