I have pulled some records from database that look like as following and are assigned a variable called users
[#
<User id: 53433, first_name: "Héctor", last_name: "Pinzon">,
<User id: 53434, first_name: "Héctor 2", last_name: "Pinzon 2">,
]
Inside the liquid I want to iterate over them via loop
{% for user in users %}
{{ user.first_name }}
{% endfor %}
When I get the email where the first_name is supposed to appear it prints out
Liquid error: internal
Liquid error: internal
What am i doing wrong here? Why the data from users does not appear?