diff --git a/api/types.go b/api/types.go
index ecb42a96..0d21a284 100644
--- a/api/types.go
+++ b/api/types.go
@@ -76,6 +76,16 @@ func (a *Amount) AsBigInt() big.Int {
 	return big.Int(*a)
 }
 
+// AsInt64 returns Amount as int64 (0 if Amount is nil).
+// It is used only for legacy interfaces (socket.io)
+// and generally not recommended to use for possible loss of precision.
+func (a *Amount) AsInt64() int64 {
+	if a == nil {
+		return 0
+	}
+	return (*big.Int)(a).Int64()
+}
+
 // Vin contains information about single transaction input
 type Vin struct {
 	Txid       string                   `json:"txid,omitempty"`
diff --git a/api/worker.go b/api/worker.go
index 372c3202..f538683c 100644
--- a/api/worker.go
+++ b/api/worker.go
@@ -191,7 +191,9 @@ func (w *Worker) GetTransactionFromBchainTx(bchainTx *bchain.Tx, height uint32,
 						}
 					}
 				}
-				valInSat.Add(&valInSat, (*big.Int)(vin.ValueSat))
+				if vin.ValueSat != nil {
+					valInSat.Add(&valInSat, (*big.Int)(vin.ValueSat))
+				}
 			}
 		} else if w.chainType == bchain.ChainEthereumType {
 			if len(bchainVin.Addresses) > 0 {
diff --git a/server/socketio.go b/server/socketio.go
index 2a43586f..e742f3cb 100644
--- a/server/socketio.go
+++ b/server/socketio.go
@@ -15,7 +15,7 @@ import (
 
 	"github.com/golang/glog"
 	"github.com/juju/errors"
-	"github.com/martinboehm/golang-socketio"
+	gosocketio "github.com/martinboehm/golang-socketio"
 	"github.com/martinboehm/golang-socketio/transport"
 )
 
@@ -312,7 +312,7 @@ func txToResTx(tx *api.Tx) resTx {
 			Script:      &script,
 			Sequence:    int64(vin.Sequence),
 			OutputIndex: int(vin.Vout),
-			Satoshis:    (*big.Int)(vin.ValueSat).Int64(),
+			Satoshis:    vin.ValueSat.AsInt64(),
 		}
 		if len(vin.Addresses) > 0 {
 			a := vin.Addresses[0]
@@ -325,7 +325,7 @@ func txToResTx(tx *api.Tx) resTx {
 		vout := &tx.Vout[i]
 		script := vout.Hex
 		output := txOutputs{
-			Satoshis: (*big.Int)(vout.ValueSat).Int64(),
+			Satoshis: vout.ValueSat.AsInt64(),
 			Script:   &script,
 		}
 		if len(vout.Addresses) > 0 {
@@ -342,15 +342,15 @@ func txToResTx(tx *api.Tx) resTx {
 	}
 	return resTx{
 		BlockTimestamp: tx.Blocktime,
-		FeeSatoshis:    (*big.Int)(tx.FeesSat).Int64(),
+		FeeSatoshis:    tx.FeesSat.AsInt64(),
 		Hash:           tx.Txid,
 		Height:         h,
 		Hex:            tx.Hex,
 		Inputs:         inputs,
-		InputSatoshis:  (*big.Int)(tx.ValueInSat).Int64(),
+		InputSatoshis:  tx.ValueInSat.AsInt64(),
 		Locktime:       int(tx.Locktime),
 		Outputs:        outputs,
-		OutputSatoshis: (*big.Int)(tx.ValueOutSat).Int64(),
+		OutputSatoshis: tx.ValueOutSat.AsInt64(),
 		Version:        int(tx.Version),
 	}
 }
@@ -407,7 +407,9 @@ func (s *SocketIoServer) getAddressHistory(addr []string, opts *addrOpts) (res r
 					ads[a] = hi
 				}
 				hi.InputIndexes = append(hi.InputIndexes, int(vin.N))
-				totalSat.Sub(&totalSat, (*big.Int)(vin.ValueSat))
+				if vin.ValueSat != nil {
+					totalSat.Sub(&totalSat, (*big.Int)(vin.ValueSat))
+				}
 			}
 		}
 		for i := range tx.Vout {
@@ -420,7 +422,9 @@ func (s *SocketIoServer) getAddressHistory(addr []string, opts *addrOpts) (res r
 					ads[a] = hi
 				}
 				hi.OutputIndexes = append(hi.OutputIndexes, int(vout.N))
-				totalSat.Add(&totalSat, (*big.Int)(vout.ValueSat))
+				if vout.ValueSat != nil {
+					totalSat.Add(&totalSat, (*big.Int)(vout.ValueSat))
+				}
 			}
 		}
 		ahi := addressHistoryItem{}