diff --git a/backend/modules/evaluation/application/convertor/evaluation_set/evaluation_set.go b/backend/modules/evaluation/application/convertor/evaluation_set/evaluation_set.go
index 5041259e1..2c23e4f51 100644
--- a/backend/modules/evaluation/application/convertor/evaluation_set/evaluation_set.go
+++ b/backend/modules/evaluation/application/convertor/evaluation_set/evaluation_set.go
@@ -136,7 +136,7 @@ func UploadAttachmentDetailDO2DTO(do *entity.UploadAttachmentDetail) *app_eval_s
 	if do == nil {
 		return nil
 	}
-	return &app_eval_set.UploadAttachmentDetail{
+	dto := &app_eval_set.UploadAttachmentDetail{
 		ContentType:     contentTypeDO2DTO(do.ContentType),
 		ImagexServiceID: do.ImagexServiceID,
 		OriginImage:     common.ConvertImageDO2DTO(do.OriginImage),
@@ -146,8 +146,11 @@ func UploadAttachmentDetailDO2DTO(do *entity.UploadAttachmentDetail) *app_eval_s
 		OriginVideo:     common.ConvertVideoDO2DTO(do.OriginVideo),
 		Video:           common.ConvertVideoDO2DTO(do.Video),
 		ErrMsg:          do.ErrMsg,
-		ErrorType:       gptr.Of(dataset.ItemErrorType(gptr.Indirect(do.ErrorType))),
 	}
+	if do.ErrorType != nil {
+		dto.ErrorType = gptr.Of(dataset.ItemErrorType(gptr.Indirect(do.ErrorType)))
+	}
+	return dto
 }
 
 func contentTypeDO2DTO(ct *entity.ContentType) *dataset.ContentType {
diff --git a/backend/modules/evaluation/application/convertor/evaluation_set/evaluation_set_simple_test.go b/backend/modules/evaluation/application/convertor/evaluation_set/evaluation_set_simple_test.go
index 8bc351226..44644351e 100755
--- a/backend/modules/evaluation/application/convertor/evaluation_set/evaluation_set_simple_test.go
+++ b/backend/modules/evaluation/application/convertor/evaluation_set/evaluation_set_simple_test.go
@@ -294,7 +294,6 @@ func TestUploadAttachmentDetailDO2DTO(t *testing.T) {
 			input: &entity.UploadAttachmentDetail{ContentType: gptr.Of(entity.ContentTypeText)},
 			expected: &app_eval_set.UploadAttachmentDetail{
 				ContentType: gptr.Of(dataset.ContentType_Text),
-				ErrorType:   gptr.Of(dataset.ItemErrorType(0)),
 			},
 		},
 		{
@@ -302,7 +301,6 @@ func TestUploadAttachmentDetailDO2DTO(t *testing.T) {
 			input: &entity.UploadAttachmentDetail{ContentType: gptr.Of(entity.ContentTypeImage)},
 			expected: &app_eval_set.UploadAttachmentDetail{
 				ContentType: gptr.Of(dataset.ContentType_Image),
-				ErrorType:   gptr.Of(dataset.ItemErrorType(0)),
 			},
 		},
 		{
@@ -310,7 +308,6 @@ func TestUploadAttachmentDetailDO2DTO(t *testing.T) {
 			input: &entity.UploadAttachmentDetail{ContentType: gptr.Of(entity.ContentTypeAudio)},
 			expected: &app_eval_set.UploadAttachmentDetail{
 				ContentType: gptr.Of(dataset.ContentType_Audio),
-				ErrorType:   gptr.Of(dataset.ItemErrorType(0)),
 			},
 		},
 		{
@@ -318,7 +315,6 @@ func TestUploadAttachmentDetailDO2DTO(t *testing.T) {
 			input: &entity.UploadAttachmentDetail{ContentType: gptr.Of(entity.ContentTypeVideo)},
 			expected: &app_eval_set.UploadAttachmentDetail{
 				ContentType: gptr.Of(dataset.ContentType_Video),
-				ErrorType:   gptr.Of(dataset.ItemErrorType(0)),
 			},
 		},
 		{
@@ -326,22 +322,17 @@ func TestUploadAttachmentDetailDO2DTO(t *testing.T) {
 			input: &entity.UploadAttachmentDetail{ContentType: gptr.Of(entity.ContentTypeMultipart)},
 			expected: &app_eval_set.UploadAttachmentDetail{
 				ContentType: gptr.Of(dataset.ContentType_MultiPart),
-				ErrorType:   gptr.Of(dataset.ItemErrorType(0)),
 			},
 		},
 		{
-			name:  "unknown content type",
-			input: &entity.UploadAttachmentDetail{ContentType: gptr.Of(entity.ContentType("unknown"))},
-			expected: &app_eval_set.UploadAttachmentDetail{
-				ErrorType: gptr.Of(dataset.ItemErrorType(0)),
-			},
+			name:     "unknown content type",
+			input:    &entity.UploadAttachmentDetail{ContentType: gptr.Of(entity.ContentType("unknown"))},
+			expected: &app_eval_set.UploadAttachmentDetail{},
 		},
 		{
-			name:  "nil content type",
-			input: &entity.UploadAttachmentDetail{},
-			expected: &app_eval_set.UploadAttachmentDetail{
-				ErrorType: gptr.Of(dataset.ItemErrorType(0)),
-			},
+			name:     "nil content type",
+			input:    &entity.UploadAttachmentDetail{},
+			expected: &app_eval_set.UploadAttachmentDetail{},
 		},
 		{
 			name: "full fields",