diff --git a/app/frontend/src/javascript/components/store/product-form.tsx b/app/frontend/src/javascript/components/store/product-form.tsx
index 6bb1a36d6..07296e1be 100644
--- a/app/frontend/src/javascript/components/store/product-form.tsx
+++ b/app/frontend/src/javascript/components/store/product-form.tsx
@@ -280,7 +280,7 @@ export const ProductForm: React.FC<ProductFormProps> = ({ product, title, onSucc
                 <FormInput id="amount"
                             type="number"
                             register={register}
-                            rules={{ required: true, min: 0.01 }}
+                            rules={{ required: true, min: 0 }}
                             step={0.01}
                             formState={formState}
                             label={t('app.admin.store.product_form.price')} />
diff --git a/app/frontend/src/javascript/components/store/product-item.tsx b/app/frontend/src/javascript/components/store/product-item.tsx
index 177f460e7..c37f97dc1 100644
--- a/app/frontend/src/javascript/components/store/product-item.tsx
+++ b/app/frontend/src/javascript/components/store/product-item.tsx
@@ -79,12 +79,10 @@ export const ProductItem: React.FC<ProductItemProps> = ({ product, onEdit, onDel
           <span>{t('app.admin.store.product_item.stock.external')}</span>
           <p>{product.stock.external}</p>
         </div>
-        {product.amount &&
-          <div className='price'>
-            <p>{FormatLib.price(product.amount)}</p>
-            <span>/ {t('app.admin.store.product_item.unit')}</span>
-          </div>
-        }
+        <div className='price'>
+          <p>{FormatLib.price(product.amount || 0)}</p>
+          <span>/ {t('app.admin.store.product_item.unit')}</span>
+        </div>
       </div>
       <div className='actions'>
         <div className='manage'>
diff --git a/app/frontend/src/javascript/components/store/store-product-item.tsx b/app/frontend/src/javascript/components/store/store-product-item.tsx
index fef8d883a..321dc4b1e 100644
--- a/app/frontend/src/javascript/components/store/store-product-item.tsx
+++ b/app/frontend/src/javascript/components/store/store-product-item.tsx
@@ -81,12 +81,10 @@ export const StoreProductItem: React.FC<StoreProductItemProps> = ({ product, car
         <img src={productImageUrl(product)} alt='' />
       </div>
       <p className="name">{product.name}</p>
-      {product.amount &&
-        <div className='price'>
-          <p>{FormatLib.price(product.amount)}</p>
-          <span>/ {t('app.public.store_product_item.unit')}</span>
-        </div>
-      }
+      <div className='price'>
+        <p>{FormatLib.price(product.amount || 0)}</p>
+        <span>/ {t('app.public.store_product_item.unit')}</span>
+      </div>
       <FabStateLabel status={statusColor(product)}>
         {productStockStatus(product)}
       </FabStateLabel>
diff --git a/app/frontend/src/javascript/components/store/store-product.tsx b/app/frontend/src/javascript/components/store/store-product.tsx
index ac02b0931..4ebae268a 100644
--- a/app/frontend/src/javascript/components/store/store-product.tsx
+++ b/app/frontend/src/javascript/components/store/store-product.tsx
@@ -180,7 +180,7 @@ export const StoreProduct: React.FC<StoreProductProps> = ({ productSlug, current
             {productStockStatus(product)}
           </FabStateLabel>
           <div className='price'>
-            <p>{FormatLib.price(product.amount)} <sup>TTC</sup></p>
+            <p>{FormatLib.price(product.amount || 0)} <sup>TTC</sup></p>
             <span>/ {t('app.public.store_product_item.unit')}</span>
           </div>
           {product.stock.external > (product.quantity_min || 1) &&
diff --git a/app/models/product.rb b/app/models/product.rb
index 682a3f8fe..449543756 100644
--- a/app/models/product.rb
+++ b/app/models/product.rb
@@ -20,7 +20,7 @@ class Product < ApplicationRecord
   accepts_nested_attributes_for :product_stock_movements, allow_destroy: true, reject_if: :all_blank
 
   validates :name, :slug, presence: true
-  validates :amount, numericality: { greater_than: 0, allow_nil: true }
+  validates :amount, numericality: { greater_than_or_equal_to: 0, allow_nil: true }
 
   scope :active, -> { where(is_active: true) }
 
diff --git a/app/services/cart/add_item_service.rb b/app/services/cart/add_item_service.rb
index 31477a180..4fbc4ea3a 100644
--- a/app/services/cart/add_item_service.rb
+++ b/app/services/cart/add_item_service.rb
@@ -11,7 +11,7 @@ class Cart::AddItemService
     quantity = orderable.quantity_min > quantity.to_i && item.nil? ? orderable.quantity_min : quantity.to_i
 
     if item.nil?
-      item = order.order_items.new(quantity: quantity, orderable: orderable, amount: orderable.amount)
+      item = order.order_items.new(quantity: quantity, orderable: orderable, amount: orderable.amount || 0)
     else
       item.quantity += quantity.to_i
     end