diff --git a/framework/src/Volo.Abp.Ddd.Domain/Volo/Abp/DependencyInjection/AbpCommonDbContextRegistrationOptions.cs b/framework/src/Volo.Abp.Ddd.Domain/Volo/Abp/DependencyInjection/AbpCommonDbContextRegistrationOptions.cs
index babe1da1f9..6408e3f0fa 100644
--- a/framework/src/Volo.Abp.Ddd.Domain/Volo/Abp/DependencyInjection/AbpCommonDbContextRegistrationOptions.cs
+++ b/framework/src/Volo.Abp.Ddd.Domain/Volo/Abp/DependencyInjection/AbpCommonDbContextRegistrationOptions.cs
@@ -29,7 +29,7 @@ namespace Volo.Abp.DependencyInjection
 
         public Dictionary<Type, Type> CustomRepositories { get; }
 
-        public List<Type> DefaultRepositories { get; }
+        public List<Type> SpecifiedDefaultRepositories { get; }
 
         public bool SpecifiedDefaultRepositoryTypes => DefaultRepositoryImplementationType != null && DefaultRepositoryImplementationTypeWithoutKey != null;
 
@@ -40,7 +40,7 @@ namespace Volo.Abp.DependencyInjection
             DefaultRepositoryDbContextType = originalDbContextType;
             CustomRepositories = new Dictionary<Type, Type>();
             ReplacedDbContextTypes = new List<Type>();
-            DefaultRepositories = new List<Type>();
+            SpecifiedDefaultRepositories = new List<Type>();
         }
 
         public IAbpCommonDbContextRegistrationOptionsBuilder ReplaceDbContext<TOtherDbContext>()
@@ -92,13 +92,10 @@ namespace Volo.Abp.DependencyInjection
 
         public IAbpCommonDbContextRegistrationOptionsBuilder AddDefaultRepository(Type entityType)
         {
-            if (!typeof(IEntity).IsAssignableFrom(entityType))
-            {
-                throw new AbpException($"Given entityType is not an entity: {entityType.AssemblyQualifiedName}. It must implement {typeof(IEntity<>).AssemblyQualifiedName}.");
-            }
-
-            DefaultRepositories.AddIfNotContains(entityType);
-
+            EntityHelper.CheckEntity(entityType);
+            
+            SpecifiedDefaultRepositories.AddIfNotContains(entityType);
+            
             return this;
         }
 
diff --git a/framework/src/Volo.Abp.Ddd.Domain/Volo/Abp/Domain/Entities/EntityHelper.cs b/framework/src/Volo.Abp.Ddd.Domain/Volo/Abp/Domain/Entities/EntityHelper.cs
index 2f8dd28afc..4725496a29 100644
--- a/framework/src/Volo.Abp.Ddd.Domain/Volo/Abp/Domain/Entities/EntityHelper.cs
+++ b/framework/src/Volo.Abp.Ddd.Domain/Volo/Abp/Domain/Entities/EntityHelper.cs
@@ -118,9 +118,19 @@ namespace Volo.Abp.Domain.Entities
 
         public static bool IsEntity([NotNull] Type type)
         {
+            Check.NotNull(type, nameof(type));
             return typeof(IEntity).IsAssignableFrom(type);
         }
 
+        public static void CheckEntity([NotNull] Type type)
+        {
+            Check.NotNull(type, nameof(type));
+            if (!IsEntity(type))
+            {
+                throw new AbpException($"Given {nameof(type)} is not an entity: {type.AssemblyQualifiedName}. It must implement {typeof(IEntity).AssemblyQualifiedName}.");
+            }
+        }
+
         public static bool IsEntityWithId([NotNull] Type type)
         {
             foreach (var interfaceType in type.GetInterfaces())
diff --git a/framework/src/Volo.Abp.Ddd.Domain/Volo/Abp/Domain/Repositories/RepositoryRegistrarBase.cs b/framework/src/Volo.Abp.Ddd.Domain/Volo/Abp/Domain/Repositories/RepositoryRegistrarBase.cs
index ef686e7001..281d79a6f9 100644
--- a/framework/src/Volo.Abp.Ddd.Domain/Volo/Abp/Domain/Repositories/RepositoryRegistrarBase.cs
+++ b/framework/src/Volo.Abp.Ddd.Domain/Volo/Abp/Domain/Repositories/RepositoryRegistrarBase.cs
@@ -1,6 +1,5 @@
 using System;
 using System.Collections.Generic;
-using System.Linq;
 using Microsoft.Extensions.DependencyInjection;
 using Volo.Abp.DependencyInjection;
 using Volo.Abp.Domain.Entities;
@@ -20,9 +19,7 @@ namespace Volo.Abp.Domain.Repositories
         public virtual void AddRepositories()
         {
             RegisterCustomRepositories();
-
             RegisterDefaultRepositories();
-
             RegisterSpecifiedDefaultRepositories();
         }
 
@@ -54,7 +51,7 @@ namespace Volo.Abp.Domain.Repositories
 
         protected virtual void RegisterSpecifiedDefaultRepositories()
         {
-            foreach (var entityType in Options.DefaultRepositories)
+            foreach (var entityType in Options.SpecifiedDefaultRepositories)
             {
                 if (!Options.CustomRepositories.ContainsKey(entityType))
                 {