diff --git a/pkg/core/blockchain.go b/pkg/core/blockchain.go
index c5d88068c..ec9d14f57 100644
--- a/pkg/core/blockchain.go
+++ b/pkg/core/blockchain.go
@@ -1237,10 +1237,10 @@ func (bc *Blockchain) headerListLen() (n int) {
 	return
 }
 
-// GetTransaction returns a TX and its height by the given hash.
+// GetTransaction returns a TX and its height by the given hash. The height is MaxUint32 if tx is in the mempool.
 func (bc *Blockchain) GetTransaction(hash util.Uint256) (*transaction.Transaction, uint32, error) {
 	if tx, _, ok := bc.memPool.TryGetValue(hash); ok {
-		return tx, 0, nil // the height is not actually defined for memPool transaction. Not sure if zero is a good number in this case.
+		return tx, math.MaxUint32, nil // the height is not actually defined for memPool transaction.
 	}
 	return bc.dao.GetTransaction(hash)
 }
diff --git a/pkg/rpc/response/result/tx_raw_output.go b/pkg/rpc/response/result/tx_raw_output.go
index 3f1727f30..6b2035944 100644
--- a/pkg/rpc/response/result/tx_raw_output.go
+++ b/pkg/rpc/response/result/tx_raw_output.go
@@ -28,29 +28,27 @@ type TransactionMetadata struct {
 
 // NewTransactionOutputRaw returns a new ransactionOutputRaw object.
 func NewTransactionOutputRaw(tx *transaction.Transaction, header *block.Header, chain core.Blockchainer) TransactionOutputRaw {
-	// confirmations formula
-	confirmations := int(chain.BlockHeight() - header.Base.Index + 1)
-	return TransactionOutputRaw{
+	result := TransactionOutputRaw{
 		Transaction: tx,
 		TransactionMetadata: TransactionMetadata{
-			SysFee:        chain.SystemFee(tx),
-			NetFee:        chain.NetworkFee(tx),
-			Blockhash:     header.Hash(),
-			Confirmations: confirmations,
-			Timestamp:     header.Timestamp,
+			SysFee: chain.SystemFee(tx),
+			NetFee: chain.NetworkFee(tx),
 		},
 	}
+	if header == nil {
+		return result
+	}
+	// confirmations formula
+	confirmations := int(chain.BlockHeight() - header.Base.Index + 1)
+	result.TransactionMetadata.Blockhash = header.Hash()
+	result.TransactionMetadata.Confirmations = confirmations
+	result.TransactionMetadata.Timestamp = header.Timestamp
+	return result
 }
 
 // MarshalJSON implements json.Marshaler interface.
 func (t TransactionOutputRaw) MarshalJSON() ([]byte, error) {
-	output, err := json.Marshal(TransactionMetadata{
-		SysFee:        t.SysFee,
-		NetFee:        t.NetFee,
-		Blockhash:     t.Blockhash,
-		Confirmations: t.Confirmations,
-		Timestamp:     t.Timestamp,
-	})
+	output, err := json.Marshal(t.TransactionMetadata)
 	if err != nil {
 		return nil, err
 	}
@@ -78,17 +76,6 @@ func (t *TransactionOutputRaw) UnmarshalJSON(data []byte) error {
 	if err != nil {
 		return err
 	}
-	t.SysFee = output.SysFee
-	t.NetFee = output.NetFee
-	t.Blockhash = output.Blockhash
-	t.Confirmations = output.Confirmations
-	t.Timestamp = output.Timestamp
-
-	transaction := new(transaction.Transaction)
-	err = json.Unmarshal(data, transaction)
-	if err != nil {
-		return err
-	}
-	t.Transaction = transaction
-	return nil
+	t.TransactionMetadata = *output
+	return json.Unmarshal(data, &t.Transaction)
 }
diff --git a/pkg/rpc/response/result/unclaimed.go b/pkg/rpc/response/result/unclaimed.go
index e636f5c1a..54ea4e94d 100644
--- a/pkg/rpc/response/result/unclaimed.go
+++ b/pkg/rpc/response/result/unclaimed.go
@@ -1,6 +1,9 @@
 package result
 
 import (
+	"errors"
+	"math"
+
 	"github.com/nspcc-dev/neo-go/pkg/core"
 	"github.com/nspcc-dev/neo-go/pkg/core/state"
 	"github.com/nspcc-dev/neo-go/pkg/util"
@@ -38,6 +41,9 @@ func NewUnclaimed(a *state.Account, chain core.Blockchainer) (*Unclaimed, error)
 		if err != nil {
 			return nil, err
 		}
+		if txHeight == math.MaxUint32 {
+			return nil, errors.New("wrong transaction stored in account data")
+		}
 		gen, sys, err := chain.CalculateClaimable(usb.Value, txHeight, blockHeight)
 		if err != nil {
 			return nil, err
diff --git a/pkg/rpc/server/server.go b/pkg/rpc/server/server.go
index 6eabd408d..f79bf7694 100644
--- a/pkg/rpc/server/server.go
+++ b/pkg/rpc/server/server.go
@@ -5,6 +5,7 @@ import (
 	"encoding/hex"
 	"encoding/json"
 	"fmt"
+	"math"
 	"net"
 	"net/http"
 	"strconv"
@@ -1159,27 +1160,29 @@ func (s *Server) getStorage(ps request.Params) (interface{}, *response.Error) {
 }
 
 func (s *Server) getrawtransaction(reqParams request.Params) (interface{}, *response.Error) {
-	var resultsErr *response.Error
-	var results interface{}
-
-	if txHash, err := reqParams.Value(0).GetUint256(); err != nil {
-		resultsErr = response.ErrInvalidParams
-	} else if tx, height, err := s.chain.GetTransaction(txHash); err != nil {
+	txHash, err := reqParams.Value(0).GetUint256()
+	if err != nil {
+		return nil, response.ErrInvalidParams
+	}
+	tx, height, err := s.chain.GetTransaction(txHash)
+	if err != nil {
 		err = errors.Wrapf(err, "Invalid transaction hash: %s", txHash)
 		return nil, response.NewRPCError("Unknown transaction", err.Error(), err)
-	} else if reqParams.Value(1).GetBoolean() {
+	}
+	if reqParams.Value(1).GetBoolean() {
+		if height == math.MaxUint32 {
+			return result.NewTransactionOutputRaw(tx, nil, s.chain), nil
+		}
 		_header := s.chain.GetHeaderHash(int(height))
 		header, err := s.chain.GetHeader(_header)
 		if err != nil {
-			resultsErr = response.NewInvalidParamsError(err.Error(), err)
-		} else {
-			results = result.NewTransactionOutputRaw(tx, header, s.chain)
+			return nil, response.NewInvalidParamsError(err.Error(), err)
 		}
-	} else {
-		results = hex.EncodeToString(tx.Bytes())
-	}
+		return result.NewTransactionOutputRaw(tx, header, s.chain), nil
+
+	}
+	return hex.EncodeToString(tx.Bytes()), nil
 
-	return results, resultsErr
 }
 
 func (s *Server) getTransactionHeight(ps request.Params) (interface{}, *response.Error) {
@@ -1189,7 +1192,7 @@ func (s *Server) getTransactionHeight(ps request.Params) (interface{}, *response
 	}
 
 	_, height, err := s.chain.GetTransaction(h)
-	if err != nil {
+	if err != nil || height == math.MaxUint32 {
 		return nil, response.NewRPCError("unknown transaction", "", nil)
 	}