diff --git a/pkg/core/blockchain.go b/pkg/core/blockchain.go
index 4fc630860..068401b03 100644
--- a/pkg/core/blockchain.go
+++ b/pkg/core/blockchain.go
@@ -169,7 +169,9 @@ func (bc *Blockchain) Run(ctx context.Context) {
 		case <-persistTimer.C:
 			go func() {
 				err := bc.Persist(ctx)
-				log.Warnf("failed to persist blockchain: %s", err)
+				if err != nil {
+					log.Warnf("failed to persist blockchain: %s", err)
+				}
 			}()
 			persistTimer.Reset(persistInterval)
 		}
@@ -412,7 +414,6 @@ func (bc *Blockchain) Persist(ctx context.Context) (err error) {
 			hash := headerList.Get(int(bc.BlockHeight() + 1))
 			if block, ok := bc.blockCache.GetBlock(hash); ok {
 				if err = bc.persistBlock(block); err != nil {
-					log.Warnf("failed to persist blocks: %s", err)
 					return
 				}
 				bc.blockCache.Delete(hash)
diff --git a/pkg/core/storage/boltdb_store.go b/pkg/core/storage/boltdb_store.go
index e63ec95e0..ffa1d4ecb 100644
--- a/pkg/core/storage/boltdb_store.go
+++ b/pkg/core/storage/boltdb_store.go
@@ -36,7 +36,11 @@ func (b *BoltDBBatch) Len() int {
 
 // Put implements the Batch interface.
 func (b *BoltDBBatch) Put(k, v []byte) {
-	b.mem[&k] = v
+	vcopy := make([]byte, len(v))
+	copy(vcopy, v)
+	kcopy := make([]byte, len(k))
+	copy(kcopy, k)
+	b.mem[&kcopy] = vcopy
 }
 
 // NewBoltDBStore returns a new ready to use BoltDB storage with created bucket.
diff --git a/pkg/core/storage/boltdb_store_test.go b/pkg/core/storage/boltdb_store_test.go
index 51128b749..ac23d136a 100644
--- a/pkg/core/storage/boltdb_store_test.go
+++ b/pkg/core/storage/boltdb_store_test.go
@@ -26,11 +26,17 @@ func TestBoltDBBatch_Len(t *testing.T) {
 
 func TestBoltDBBatch_PutBatchAndGet(t *testing.T) {
 	key := []byte("foo")
+	keycopy := make([]byte, len(key))
+	copy(keycopy, key)
 	value := []byte("bar")
-	batch := &BoltDBBatch{mem: map[*[]byte][]byte{&key: value}}
-
+	valuecopy := make([]byte, len(value))
+	copy(valuecopy, value)
 	boltDBStore := openStore(t)
+	batch := boltDBStore.Batch()
 
+	batch.Put(keycopy, valuecopy)
+	copy(valuecopy, key)
+	copy(keycopy, value)
 	errPut := boltDBStore.PutBatch(batch)
 	assert.Nil(t, errPut, "Error while PutBatch")
 
diff --git a/pkg/network/message.go b/pkg/network/message.go
index 1f702fc9f..187c7c9d9 100644
--- a/pkg/network/message.go
+++ b/pkg/network/message.go
@@ -3,6 +3,7 @@ package network
 import (
 	"encoding/binary"
 	"errors"
+	"fmt"
 
 	"github.com/CityOfZion/neo-go/config"
 	"github.com/CityOfZion/neo-go/pkg/core"
@@ -193,6 +194,8 @@ func (m *Message) decodePayload(br *io.BinReader) error {
 		p = &transaction.Transaction{}
 	case CMDMerkleBlock:
 		p = &payload.MerkleBlock{}
+	default:
+		return fmt.Errorf("can't decode command %s", cmdByteArrayToString(m.Command))
 	}
 	p.DecodeBinary(r)
 	if r.Err != nil {