diff --git a/walletnode/api/services/cascade.go b/walletnode/api/services/cascade.go
index a79144e1d..13d3c3f47 100644
--- a/walletnode/api/services/cascade.go
+++ b/walletnode/api/services/cascade.go
@@ -139,15 +139,15 @@ func (service *CascadeAPIHandler) StartProcessing(ctx context.Context, p *cascad
 		}
 
 		sortedBurnTxids, err := service.register.SortBurnTxIDs(ctx, p.BurnTxids)
-		if err == nil {
+		if err != nil {
 			return nil, cascade.MakeInternalServerError(err)
 		}
 
 		sortedRelatedFiles := service.register.SortFilesWithHigherAmounts(relatedFiles)
-		if err == nil {
-			return nil, cascade.MakeInternalServerError(err)
+		if len(sortedRelatedFiles) < 1 {
+			log.WithContext(ctx).WithField("sorted_related_files", sortedRelatedFiles).Info("Sorted related files")
+			return nil, cascade.MakeInternalServerError(errors.New("Sorted related files"))
 		}
-		log.WithContext(ctx).WithField("sorted_related_files", sortedRelatedFiles).Info("Sorted related files")
 
 		var taskIDs string
 		for index, file := range relatedFiles {