#Django-unicorn + sorl_thumbnail work on a models but not on anothers

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tough gull
# 
{% load sorl_thumbnail %}
<div class="row">
    {% for amphibian in amphibians %}
        <div class="col-sm-6 col-xl-3">
            <div class="card overflow-hidden rounded-2">
                <div class="position-relative">
                    <a href="{% url 'card:amphibian-detail' amphibian.slug %}"
                       title="TerrarioPedia - Amphibiens - Fiche d'élevage {{ amphibian.get_scientific_name }}">
                       {% thumbnail amphibian.image "335x235" crop="center" as im %}
                         {{ im.height }}
                        {% endthumbnail %}</a>
                </div>
                <div class="card-body pt-3 p-4">
                    <h6 class="fw-semibold fs-4">{{ amphibian.get_scientific_name }}</h6>
                </div>
            </div>
        </div>
    {% endfor %}
</div>```
#

There is my functions "*-list.py" :

class AmphibianListView(UnicornView):
    show_quantity = 0
    snakes = Amphibian.objects.none()

    def __init__(self, *args, **kwargs):
        super().__init__(**kwargs)
        self.show_quantity = kwargs.get("quantity")
        self.load(self.show_quantity)

    def load(self, quantity):
        if self.show_quantity != 0:
            self.snakes = Amphibian.objects.order_by('genus', 'species')[:quantity]
        else:
            self.snakes = Amphibian.objects.order_by('genus', 'species')
from django_unicorn.components import UnicornView
from card.models import Snake


class SnakeListView(UnicornView):
    show_quantity = 0
    snakes = Snake.objects.none()

    def __init__(self, *args, **kwargs):
        super().__init__(**kwargs)
        self.show_quantity = kwargs.get("quantity")
        self.load(self.show_quantity)

    def load(self, quantity):
        if self.show_quantity != 0:
            self.snakes = Snake.objects.order_by('genus', 'species')[:quantity]
        else:
            self.snakes = Snake.objects.order_by('genus', 'species')

The code {{ im.width }} and {{ im.height }} in amphibians doesn't work ('NoneType' object is not subscriptable) but in snake he's fine.

plain geode