diff --git a/lib/pact_broker/api/decorators/webhook_decorator.rb b/lib/pact_broker/api/decorators/webhook_decorator.rb
index f82c13e15..733e26803 100644
--- a/lib/pact_broker/api/decorators/webhook_decorator.rb
+++ b/lib/pact_broker/api/decorators/webhook_decorator.rb
@@ -11,18 +11,17 @@ module PactBroker
   module Api
     module Decorators
       class WebhookDecorator < BaseDecorator
-
         class WebhookEventDecorator < BaseDecorator
           property :name
         end
 
         property :description, getter: lambda { |context| context[:represented].display_description }
 
-        property :consumer, :class => PactBroker::Domain::Pacticipant do
+        property :consumer, :class => PactBroker::Domain::Pacticipant, default: nil do
           property :name
         end
 
-        property :provider, :class => PactBroker::Domain::Pacticipant do
+        property :provider, :class => PactBroker::Domain::Pacticipant, default: nil do
           property :name
         end
 
diff --git a/spec/lib/pact_broker/api/decorators/webhook_decorator_spec.rb b/spec/lib/pact_broker/api/decorators/webhook_decorator_spec.rb
index 1ae45a590..510c4d15d 100644
--- a/spec/lib/pact_broker/api/decorators/webhook_decorator_spec.rb
+++ b/spec/lib/pact_broker/api/decorators/webhook_decorator_spec.rb
@@ -189,6 +189,20 @@ module Decorators
               expect(parsed_object.events.first.name).to eq PactBroker::Webhooks::WebhookEvent::DEFAULT_EVENT_NAME
             end
           end
+
+          context "when the decorated object has a consumer/provider but the incoming JSON does not" do
+            let(:webhook) do
+              Domain::Webhook.new(
+                consumer: Domain::Pacticipant.new(name: 'consumer'),
+                provider: Domain::Pacticipant.new(name: 'provider')
+              )
+            end
+
+            it "sets the consumer and provider to nil on the decorated object" do
+              expect(parsed_object.consumer).to be nil
+              expect(parsed_object.provider).to be nil
+            end
+          end
         end
       end
     end