diff --git a/framework/src/Volo.Abp.EventBus/Volo/Abp/EventBus/EventBusBase.cs b/framework/src/Volo.Abp.EventBus/Volo/Abp/EventBus/EventBusBase.cs
index ef5c5cdabc..7c60d69063 100644
--- a/framework/src/Volo.Abp.EventBus/Volo/Abp/EventBus/EventBusBase.cs
+++ b/framework/src/Volo.Abp.EventBus/Volo/Abp/EventBus/EventBusBase.cs
@@ -135,7 +135,7 @@ public abstract class EventBusBase : IEventBus
     {
         await new SynchronizationContextRemover();
 
-        foreach (var handlerFactories in GetHandlerFactories(eventType))
+        foreach (var handlerFactories in GetHandlerFactories(eventType).ToList())
         {
             foreach (var handlerFactory in handlerFactories.EventHandlerFactories)
             {