Help creating a Liquid link from a merge tag

Hi there,

I am crafting an email with merge tags. I think the following Liquid code inserts the URL in the magic_link_june_2023 attribute if it exists for the user and displays “No magic link” otherwise. However, when I preview the email in customer.io’s email builder tool, it always shows “No magic link” even though the attribute exists. 

What am I doing wrong?

{% if customer.magic_link_june_2023 > 0 %}

{{customer.magic_link_june_2023}}   

{% else %}

No magic link

{% endif %}