diff --git a/pool/tree/pool.go b/pool/tree/pool.go
index 171a627..ff155dc 100644
--- a/pool/tree/pool.go
+++ b/pool/tree/pool.go
@@ -725,7 +725,7 @@ func (p *Pool) requestWithRetry(fn func(client grpcService.TreeServiceClient) er
 	groupsLen := len(p.innerPools)
 	for i := startI; i < startI+groupsLen; i++ {
 		indexI := i % groupsLen
-		clientsLen := len(p.innerPools[i].clients)
+		clientsLen := len(p.innerPools[indexI].clients)
 		for j := startJ; j < startJ+clientsLen; j++ {
 			indexJ := j % clientsLen
 			if cl, err = p.innerPools[indexI].clients[indexJ].serviceClient(); err == nil {
diff --git a/pool/tree/pool_test.go b/pool/tree/pool_test.go
index 8c8a0cf..1c73205 100644
--- a/pool/tree/pool_test.go
+++ b/pool/tree/pool_test.go
@@ -3,10 +3,10 @@ package tree
 import (
 	"context"
 	"errors"
-	grpcService "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/pool/tree/service"
 	"testing"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/pool"
+	grpcService "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/pool/tree/service"
 	"github.com/stretchr/testify/require"
 	"go.uber.org/zap/zaptest"
 )
@@ -148,6 +148,14 @@ func TestRetry(t *testing.T) {
 		require.NoError(t, err)
 		checkIndicesAndReset(t, p, 1, 0)
 	})
+
+	t.Run("no panic group switch", func(t *testing.T) {
+		setErrors(p, nodes[1]...)
+		p.setStartIndices(1, 0)
+		err := p.requestWithRetry(makeFn)
+		require.NoError(t, err)
+		checkIndicesAndReset(t, p, 0, 0)
+	})
 }
 
 func TestRebalance(t *testing.T) {
@@ -246,8 +254,7 @@ func checkIndicesAndReset(t *testing.T, p *Pool, iExp, jExp int) {
 
 func checkIndices(t *testing.T, p *Pool, iExp, jExp int) {
 	i, j := p.getStartIndices()
-	require.Equal(t, iExp, i)
-	require.Equal(t, jExp, j)
+	require.Equal(t, [2]int{iExp, jExp}, [2]int{i, j})
 }
 
 func resetClients(p *Pool) {