diff --git a/lib/open_food_network/reports/parameters/base.rb b/lib/open_food_network/reports/parameters/base.rb
index 22e2d5ac89..9b97558ad3 100644
--- a/lib/open_food_network/reports/parameters/base.rb
+++ b/lib/open_food_network/reports/parameters/base.rb
@@ -5,6 +5,7 @@ module OpenFoodNetwork
         extend ActiveModel::Naming
         extend ActiveModel::Translation
         include ActiveModel::Validations
+        include ActiveModel::Validations::Callbacks
 
         def initialize(attributes = {})
           attributes.each do |key, value|
diff --git a/lib/order_management/reports/enterprise_fee_summary/parameters.rb b/lib/order_management/reports/enterprise_fee_summary/parameters.rb
index 418038967c..0404326826 100644
--- a/lib/order_management/reports/enterprise_fee_summary/parameters.rb
+++ b/lib/order_management/reports/enterprise_fee_summary/parameters.rb
@@ -15,6 +15,8 @@ module OrderManagement
         attr_accessor :start_at, :end_at, :distributor_ids, :producer_ids, :order_cycle_ids,
                       :enterprise_fee_ids, :shipping_method_ids, :payment_method_ids
 
+        before_validation :cleanup_arrays
+
         validates :start_at, :end_at, date_time_string: true
         validates :distributor_ids, :producer_ids, integer_array: true
         validates :order_cycle_ids, integer_array: true
@@ -41,6 +43,20 @@ module OrderManagement
 
           errors.add(:end_at, DATE_END_BEFORE_START_ERROR) unless start_at < end_at
         end
+
+        # Remove the blank strings that Rails multiple selects add by default to
+        # make sure that blank lists are still submitted to the server as arrays
+        # instead of nil.
+        #
+        # https://api.rubyonrails.org/classes/ActionView/Helpers/FormOptionsHelper.html#method-i-select
+        def cleanup_arrays
+          distributor_ids.reject!(&:blank?)
+          producer_ids.reject!(&:blank?)
+          order_cycle_ids.reject!(&:blank?)
+          enterprise_fee_ids.reject!(&:blank?)
+          shipping_method_ids.reject!(&:blank?)
+          payment_method_ids.reject!(&:blank?)
+        end
       end
     end
   end
diff --git a/spec/lib/order_management/reports/enterprise_fee_summary/parameters_spec.rb b/spec/lib/order_management/reports/enterprise_fee_summary/parameters_spec.rb
index 94aac5e323..148e32214f 100644
--- a/spec/lib/order_management/reports/enterprise_fee_summary/parameters_spec.rb
+++ b/spec/lib/order_management/reports/enterprise_fee_summary/parameters_spec.rb
@@ -21,6 +21,24 @@ describe OrderManagement::Reports::EnterpriseFeeSummary::Parameters do
       it { expect(subject).to validate_integer_array(:shipping_method_ids) }
       it { expect(subject).to validate_integer_array(:payment_method_ids) }
 
+      it "allows integer arrays to include blank string and cleans it up" do
+        subject.distributor_ids = ["", "1"]
+        subject.producer_ids = ["", "1"]
+        subject.order_cycle_ids = ["", "1"]
+        subject.enterprise_fee_ids = ["", "1"]
+        subject.shipping_method_ids = ["", "1"]
+        subject.payment_method_ids = ["", "1"]
+
+        expect(subject).to be_valid
+
+        expect(subject.distributor_ids).to eq(["1"])
+        expect(subject.producer_ids).to eq(["1"])
+        expect(subject.order_cycle_ids).to eq(["1"])
+        expect(subject.enterprise_fee_ids).to eq(["1"])
+        expect(subject.shipping_method_ids).to eq(["1"])
+        expect(subject.payment_method_ids).to eq(["1"])
+      end
+
       describe "requiring start_at to be before end_at" do
         let(:now) { Time.zone.now }