diff --git a/app/assets/javascripts/app/models/ticket.coffee b/app/assets/javascripts/app/models/ticket.coffee
index c97515eec..120fa6b40 100644
--- a/app/assets/javascripts/app/models/ticket.coffee
+++ b/app/assets/javascripts/app/models/ticket.coffee
@@ -164,7 +164,7 @@ class App.Ticket extends App.Model
           params.ticket[attributes[1]] = pendtil.toISOString()
 
         # apply user changes
-        else if attributes[1] is 'owner_id'
+        else if attributes[1] is 'owner_id' || attributes[1] is 'customer_id'
           if content.pre_condition is 'current_user.id'
             params.ticket[attributes[1]] = App.Session.get('id')
           else
diff --git a/spec/system/ticket/zoom_spec.rb b/spec/system/ticket/zoom_spec.rb
index 68c987e3f..40dbb0957 100644
--- a/spec/system/ticket/zoom_spec.rb
+++ b/spec/system/ticket/zoom_spec.rb
@@ -2590,4 +2590,25 @@ RSpec.describe 'Ticket zoom', type: :system do
       expect(page).to have_selector('.sidebar-content', text: 'mail001.box')
     end
   end
+
+  describe 'Error “customer_id required” on Macro execution #4022', authenticated_as: :authenticate do
+    let(:ticket) { create(:ticket, group: Group.first) }
+    let(:macro) { create(:macro, perform: { 'ticket.customer_id'=>{ 'pre_condition' => 'current_user.id', 'value' => nil, 'value_completion' => '' } }) }
+
+    def authenticate
+      ticket && macro
+
+      true
+    end
+
+    before do
+      visit "#ticket/zoom/#{ticket.id}"
+    end
+
+    it 'does set the agent as customer via macro' do
+      click '.js-openDropdownMacro'
+      page.find(:macro, macro.id).click
+      expect(ticket.reload.customer_id).to eq(User.find_by(email: 'admin@example.com').id)
+    end
+  end
 end