[RSS Feed/News] IF a question thread has a solution...

[XenForo]

I try to display content with this conditional statement:
HTML:

<xf:if is="$thread.discussion_type == 'question' && $thread.type_data.solution_post_id != 'null'">
    NO SOLUTION
<xf:else />
    SOLUTION
</xf:if>

But it does not matter if the thread has a solution or not it displays the SOLUTION content, where is my error?
Thanks!

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