From 5bfcf0a2bb0e0049b4dd9b201251534b39610af4 Mon Sep 17 00:00:00 2001
From: William Obando <william@oban.do>
Date: Wed, 27 Apr 2022 11:36:14 -0400
Subject: [PATCH] Ignore messages without subject

---
 .../Volo/Abp/EventBus/Azure/AzureDistributedEventBus.cs       | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/framework/src/Volo.Abp.EventBus.Azure/Volo/Abp/EventBus/Azure/AzureDistributedEventBus.cs b/framework/src/Volo.Abp.EventBus.Azure/Volo/Abp/EventBus/Azure/AzureDistributedEventBus.cs
index d8a3d1341a..0247d90be1 100644
--- a/framework/src/Volo.Abp.EventBus.Azure/Volo/Abp/EventBus/Azure/AzureDistributedEventBus.cs
+++ b/framework/src/Volo.Abp.EventBus.Azure/Volo/Abp/EventBus/Azure/AzureDistributedEventBus.cs
@@ -71,6 +71,10 @@ public class AzureDistributedEventBus : DistributedEventBusBase, ISingletonDepen
     private async Task ProcessEventAsync(ServiceBusReceivedMessage message)
     {
         var eventName = message.Subject;
+        if (eventName == null)
+        {
+            return;
+        }
         var eventType = _eventTypes.GetOrDefault(eventName);
         if (eventType == null)
         {