diff --git a/framework/src/Volo.Abp.EventBus/Volo/Abp/EventBus/Distributed/DistributedEventBusBase.cs b/framework/src/Volo.Abp.EventBus/Volo/Abp/EventBus/Distributed/DistributedEventBusBase.cs
index 72a20748c68..96a11f928ec 100644
--- a/framework/src/Volo.Abp.EventBus/Volo/Abp/EventBus/Distributed/DistributedEventBusBase.cs
+++ b/framework/src/Volo.Abp.EventBus/Volo/Abp/EventBus/Distributed/DistributedEventBusBase.cs
@@ -132,7 +132,13 @@ protected virtual async Task<bool> AddToOutboxAsync(Type eventType, object event
                     Serialize(eventData),
                     Clock.Now
                 );
-                outgoingEventInfo.SetCorrelationId(CorrelationIdProvider.Get()!);
+
+                var correlationId = CorrelationIdProvider.Get();
+                if (correlationId != null)
+                {
+                    outgoingEventInfo.SetCorrelationId(correlationId);
+                }
+
                 await eventOutbox.EnqueueAsync(outgoingEventInfo);
                 return true;
             }
diff --git a/framework/src/Volo.Abp.Http.Client/Volo/Abp/Http/Client/ClientProxying/ClientProxyBase.cs b/framework/src/Volo.Abp.Http.Client/Volo/Abp/Http/Client/ClientProxying/ClientProxyBase.cs
index a4306050a4d..e2562d28cd1 100644
--- a/framework/src/Volo.Abp.Http.Client/Volo/Abp/Http/Client/ClientProxying/ClientProxyBase.cs
+++ b/framework/src/Volo.Abp.Http.Client/Volo/Abp/Http/Client/ClientProxying/ClientProxyBase.cs
@@ -309,7 +309,11 @@ protected virtual void AddHeaders(
         }
 
         //CorrelationId
-        requestMessage.Headers.Add(AbpCorrelationIdOptions.Value.HttpHeaderName, CorrelationIdProvider.Get());
+        var correlationId = CorrelationIdProvider.Get();
+        if (correlationId != null)
+        {
+            requestMessage.Headers.Add(AbpCorrelationIdOptions.Value.HttpHeaderName, correlationId);
+        }
 
         //TenantId
         if (CurrentTenant.Id.HasValue)
diff --git a/framework/src/Volo.Abp.Http.Client/Volo/Abp/Http/Client/DynamicProxying/ApiDescriptionFinder.cs b/framework/src/Volo.Abp.Http.Client/Volo/Abp/Http/Client/DynamicProxying/ApiDescriptionFinder.cs
index 10089c52cd0..e54e24ced0e 100644
--- a/framework/src/Volo.Abp.Http.Client/Volo/Abp/Http/Client/DynamicProxying/ApiDescriptionFinder.cs
+++ b/framework/src/Volo.Abp.Http.Client/Volo/Abp/Http/Client/DynamicProxying/ApiDescriptionFinder.cs
@@ -126,7 +126,11 @@ protected virtual async Task<ApplicationApiDescriptionModel> GetApiDescriptionFr
     protected virtual void AddHeaders(HttpRequestMessage requestMessage)
     {
         //CorrelationId
-        requestMessage.Headers.Add(AbpCorrelationIdOptions.HttpHeaderName, CorrelationIdProvider.Get());
+        var correlationId = CorrelationIdProvider.Get();
+        if (correlationId != null)
+        {
+            requestMessage.Headers.Add(AbpCorrelationIdOptions.HttpHeaderName, correlationId);
+        }
 
         //TenantId
         if (CurrentTenant.Id.HasValue)