diff --git a/cloud-functions/common/common.go b/cloud-functions/common/common.go
index 0d08f8ed..a0b1a461 100644
--- a/cloud-functions/common/common.go
+++ b/cloud-functions/common/common.go
@@ -3,6 +3,7 @@ package common
 import (
 	"context"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"math/rand"
 	"strconv"
@@ -416,11 +417,12 @@ func GetInstancesByLabel(ctx context.Context, project, zone, labelKey, labelValu
 	listInstanceIter := instanceClient.List(ctx, listInstanceRequest)
 
 	for {
-		resp, err := listInstanceIter.Next()
-		if err == iterator.Done {
+		resp, err2 := listInstanceIter.Next()
+		if errors.Is(err2, iterator.Done) {
 			break
 		}
-		if err != nil {
+		if err2 != nil {
+			err = fmt.Errorf("error getting next instances by label: %w", err2)
 			log.Error().Err(err).Send()
 			break
 		}
diff --git a/cloud-functions/main.go b/cloud-functions/main.go
index 76b8badb..553ccc47 100644
--- a/cloud-functions/main.go
+++ b/cloud-functions/main.go
@@ -412,7 +412,9 @@ func ScaleUp(w http.ResponseWriter, r *http.Request) {
 		err = fmt.Errorf("failed getting instances by cluster label: %w", err)
 		log.Error().Err(err).Send()
 		respondWithErr(w, err, http.StatusBadRequest)
+		return
 	}
+
 	backendsNumber := len(backends)
 	log.Info().Msgf("Number of backends is: %d", backendsNumber)