diff --git a/pkg/models/tasks.go b/pkg/models/tasks.go
index f08b71123..8729cead2 100644
--- a/pkg/models/tasks.go
+++ b/pkg/models/tasks.go
@@ -640,6 +640,7 @@ func checkBucketLimit(s *xorm.Session, t *Task, bucket *Bucket) (err error) {
 	if bucket.Limit > 0 {
 		taskCount, err := s.
 			Where("bucket_id = ?", bucket.ID).
+			GroupBy("task_id").
 			Count(&TaskBucket{})
 		if err != nil {
 			return err