diff --git a/lib/storage/storage.go b/lib/storage/storage.go
index 5956f35b8..ab217dbec 100644
--- a/lib/storage/storage.go
+++ b/lib/storage/storage.go
@@ -970,7 +970,7 @@ func (s *Storage) add(rows []rawRow, mrs []MetricRow, precisionBits uint8) ([]ra
 	if err := s.tb.AddRows(rows); err != nil {
 		lastError = fmt.Errorf("cannot add rows to table: %s", err)
 	}
-	if err := s.updatePerDateData(rows, lastError); err != nil lastError == nil {
+	if err := s.updatePerDateData(rows, lastError); err != nil && lastError == nil {
 		lastError = fmt.Errorf("cannot update per-date data: %s", err)
 	}
 	if lastError != nil {