diff --git a/src/Plugins/Nop.Plugin.Misc.Brevo/Services/MarketingAutomationManager.cs b/src/Plugins/Nop.Plugin.Misc.Brevo/Services/MarketingAutomationManager.cs
index f518583eeb3..28544138eb3 100644
--- a/src/Plugins/Nop.Plugin.Misc.Brevo/Services/MarketingAutomationManager.cs
+++ b/src/Plugins/Nop.Plugin.Misc.Brevo/Services/MarketingAutomationManager.cs
@@ -252,11 +252,13 @@ public async Task HandleOrderCompletedEventAsync(Order order)
         ArgumentNullException.ThrowIfNull(order);
 
         var customer = await _customerService.GetCustomerByIdAsync(order.CustomerId);
+        var shippingAddress = await _addressService.GetAddressByIdAsync(order.ShippingAddressId ?? 0);
+        var billingAddress = await _addressService.GetAddressByIdAsync(order.BillingAddressId);
 
         try
         {
             //first, try to identify current customer
-            await _marketingAutomationHttpClient.RequestAsync(new IdentifyRequest { Email = customer.Email });
+            await _marketingAutomationHttpClient.RequestAsync(new IdentifyRequest { Email = customer.Email ?? billingAddress.Email });
 
             //get URL helper
             var urlHelper = _urlHelperFactory.GetUrlHelper(_actionContextAccessor.ActionContext);
@@ -296,9 +298,6 @@ public async Task HandleOrderCompletedEventAsync(Order order)
                 };
             }).ToArrayAsync();
 
-            var shippingAddress = await _addressService.GetAddressByIdAsync(order.ShippingAddressId ?? 0);
-            var billingAddress = await _addressService.GetAddressByIdAsync(order.BillingAddressId);
-
             var shippingAddressData = new
             {
                 firstname = shippingAddress?.FirstName,
@@ -356,7 +355,7 @@ public async Task HandleOrderCompletedEventAsync(Order order)
             //create track event object
             var trackEvent = new TrackEventRequest
             {
-                Email = customer.Email,
+                Email = customer.Email ?? billingAddress.Email,
                 EventName = BrevoDefaults.OrderCompletedEventName,
                 EventData = new { id = $"cart:{shoppingCartGuid}", data = cartData }
             };