diff --git a/modules/convert/cloudbrain.go b/modules/convert/cloudbrain.go
index 599da4800..13c1d7c31 100644
--- a/modules/convert/cloudbrain.go
+++ b/modules/convert/cloudbrain.go
@@ -34,8 +34,7 @@ func ToCloudBrain(task *models.Cloudbrain) *api.Cloudbrain {
 
 		StartTime: int64(task.StartTime),
 		EndTime:   int64(task.EndTime),
-
-		Spec: ToSpecification(task.Spec),
+		Spec:      ToSpecification(task.Spec),
 	}
 }
 func ToAttachment(attachment *models.Attachment) *api.AttachmentShow {
@@ -89,6 +88,9 @@ func ToDataset(dataset *models.Dataset) *api.Dataset {
 }
 
 func ToSpecification(s *models.Specification) *api.SpecificationShow {
+	if s == nil {
+		return nil
+	}
 	return &api.SpecificationShow{
 		ID:              s.ID,
 		AccCardsNum:     s.AccCardsNum,