diff --git a/src/Plugins/BotSharp.Plugin.Twilio/Services/TwilioMessageQueueService.cs b/src/Plugins/BotSharp.Plugin.Twilio/Services/TwilioMessageQueueService.cs
index 771bb582..2c942aa5 100644
--- a/src/Plugins/BotSharp.Plugin.Twilio/Services/TwilioMessageQueueService.cs
+++ b/src/Plugins/BotSharp.Plugin.Twilio/Services/TwilioMessageQueueService.cs
@@ -65,7 +65,7 @@ namespace BotSharp.Plugin.Twilio.Services
             var httpContext = sp.GetRequiredService<IHttpContextAccessor>();
             httpContext.HttpContext = new DefaultHttpContext();
             httpContext.HttpContext.User = new ClaimsPrincipal(new ClaimsIdentity());
-            foreach (var header in message.RequestHeaders)
+            foreach (var header in message.RequestHeaders ?? [])
             {
                 httpContext.HttpContext.Request.Headers[header.Key] = header.Value;
             }