diff --git a/app/helpers/orders_helper.rb b/app/helpers/orders_helper.rb
index 24c1d3c5..54233d05 100644
--- a/app/helpers/orders_helper.rb
+++ b/app/helpers/orders_helper.rb
@@ -152,7 +152,7 @@ def ratio_quantity_data(order_article, default_unit = nil)
     data['supplier-order-unit'] = order_article.article_version.supplier_order_unit
     data['default-unit'] = default_unit
     data['custom-unit'] = order_article.article_version.unit
-    order_article.article_version.article_unit_ratios.all.each_with_index do |ratio, index|
+    order_article.article_version.article_unit_ratios.each_with_index do |ratio, index|
       data["ratio-quantity-#{index}"] = ratio.quantity
       data["ratio-unit-#{index}"] = ratio.unit
     end
diff --git a/app/models/concerns/price_calculation.rb b/app/models/concerns/price_calculation.rb
index 1a0c2c7c..d9339133 100644
--- a/app/models/concerns/price_calculation.rb
+++ b/app/models/concerns/price_calculation.rb
@@ -31,7 +31,7 @@ def fc_price
   def get_unit_ratio_quantity(unit)
     return 1 if unit == supplier_order_unit
 
-    ratio = new_record? ? article_unit_ratios.detect { |ratio| ratio[:unit] == unit } : article_unit_ratios.find_by_unit(unit)
+    ratio = new_record? ? article_unit_ratios.detect { |ratio| ratio[:unit] == unit } : find_ratio_by_unit(unit)
     return ratio.quantity unless ratio.nil?
 
     unit_hash = ArticleUnit.as_hash[unit]
@@ -77,4 +77,14 @@ def fc_group_order_price
   def add_percent(value, percent)
     (value * ((percent * 0.01) + 1)).round(2)
   end
+
+  def find_ratio_by_unit(unit)
+    begin
+      return article_unit_ratios.detect { |ratio| ratio.unit == unit } if association(:article_unit_ratios).loaded?
+    rescue StandardError
+      # continue
+    end
+
+    article_unit_ratios.find_by_unit(unit)
+  end
 end
diff --git a/app/models/order.rb b/app/models/order.rb
index 7eb79739..def3d19d 100644
--- a/app/models/order.rb
+++ b/app/models/order.rb
@@ -178,8 +178,8 @@ def stock_group_order
   # e.g: [["drugs",[teethpaste, toiletpaper]], ["fruits" => [apple, banana, lemon]]]
   def articles_grouped_by_category
     @articles_grouped_by_category ||= order_articles
-                                      .includes([:article_version, :group_order_articles,
-                                                 { article_version: :article_category }])
+                                      .includes([:group_order_articles,
+                                                 { article_version: %i[article_category article_unit_ratios] }])
                                       .order('article_versions.name')
                                       .group_by { |oa| oa.article_version.article_category.name }
                                       .sort { |a, b| a[0] <=> b[0] }
diff --git a/lib/article_units_lib.rb b/lib/article_units_lib.rb
index 481a74b1..5183c764 100644
--- a/lib/article_units_lib.rb
+++ b/lib/article_units_lib.rb
@@ -51,7 +51,7 @@ def self.unit_translations
   def self.units
     @units = {} if @units.nil?
     units_cached_in_current_locale = @units[I18n.locale]
-    return units_cached_in_current_locale unless @units_cached_in_current_locale.nil?
+    return units_cached_in_current_locale unless units_cached_in_current_locale.nil?
 
     @units[I18n.locale] = untranslated_units.to_h do |code, untranslated_unit|
       translated_name = ArticleUnitsLib.get_translated_name_for_code(code, default_nil: true)
@@ -66,7 +66,7 @@ def self.units
   end
 
   def self.unit_is_si_convertible(code)
-    !units.to_h[code]&.dig(:conversionFactor).nil?
+    !units[code]&.dig(:conversionFactor).nil?
   end
 
   def self.human_readable_unit(unit_code)