diff --git a/framework/src/Volo.Abp.EntityFrameworkCore/Volo/Abp/EntityFrameworkCore/ChangeTrackers/AbpEntityEntry.cs b/framework/src/Volo.Abp.EntityFrameworkCore/Volo/Abp/EntityFrameworkCore/ChangeTrackers/AbpEntityEntry.cs
index 5ffe3278c3..194132d001 100644
--- a/framework/src/Volo.Abp.EntityFrameworkCore/Volo/Abp/EntityFrameworkCore/ChangeTrackers/AbpEntityEntry.cs
+++ b/framework/src/Volo.Abp.EntityFrameworkCore/Volo/Abp/EntityFrameworkCore/ChangeTrackers/AbpEntityEntry.cs
@@ -48,7 +48,8 @@ public class AbpEntityEntry
 
         if (navigationEntry.NavigationEntry is CollectionEntry)
         {
-            navigationEntry.OriginalValue!.As<List<object>>().Add(entityEntry.Entity);
+            navigationEntry.OriginalValue ??= new List<object>();
+            navigationEntry.OriginalValue.As<List<object>>().Add(entityEntry.Entity);
         }
         else
         {