diff --git a/pkg/core/native/blocked_accounts_test.go b/pkg/core/native/blocked_accounts_test.go
index ac2a35a5a..76709395e 100644
--- a/pkg/core/native/blocked_accounts_test.go
+++ b/pkg/core/native/blocked_accounts_test.go
@@ -1,9 +1,11 @@
 package native
 
 import (
+	"encoding/json"
 	"testing"
 
 	"github.com/nspcc-dev/neo-go/pkg/internal/testserdes"
+	"github.com/nspcc-dev/neo-go/pkg/smartcontract"
 	"github.com/nspcc-dev/neo-go/pkg/util"
 	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
 	"github.com/stretchr/testify/require"
@@ -51,3 +53,12 @@ func TestToStackItem(t *testing.T) {
 	actual = stackitem.NewArray([]stackitem.Item{})
 	require.Equal(t, expected.ToStackItem(), actual)
 }
+
+func TestMarshallJSON(t *testing.T) {
+	ba := &BlockedAccounts{}
+	p := smartcontract.ParameterFromStackItem(ba.ToStackItem(), make(map[stackitem.Item]bool))
+	actual, err := json.Marshal(p)
+	require.NoError(t, err)
+	expected := `{"type":"Array","value":[]}`
+	require.Equal(t, expected, string(actual))
+}
diff --git a/pkg/smartcontract/parameter.go b/pkg/smartcontract/parameter.go
index e3ce46f1e..c4dfe7fc5 100644
--- a/pkg/smartcontract/parameter.go
+++ b/pkg/smartcontract/parameter.go
@@ -57,7 +57,7 @@ type rawParameter struct {
 }
 
 // MarshalJSON implements Marshaler interface.
-func (p *Parameter) MarshalJSON() ([]byte, error) {
+func (p Parameter) MarshalJSON() ([]byte, error) {
 	var (
 		resultRawValue json.RawMessage
 		resultErr      error
@@ -83,7 +83,11 @@ func (p *Parameter) MarshalJSON() ([]byte, error) {
 		}
 	case ArrayType:
 		var value = p.Value.([]Parameter)
-		resultRawValue, resultErr = json.Marshal(value)
+		if value == nil {
+			resultRawValue, resultErr = json.Marshal([]Parameter{})
+		} else {
+			resultRawValue, resultErr = json.Marshal(value)
+		}
 	case MapType:
 		ppair := p.Value.([]ParameterPair)
 		resultRawValue, resultErr = json.Marshal(ppair)
diff --git a/pkg/smartcontract/parameter_test.go b/pkg/smartcontract/parameter_test.go
index a10a127a7..818181834 100644
--- a/pkg/smartcontract/parameter_test.go
+++ b/pkg/smartcontract/parameter_test.go
@@ -131,6 +131,13 @@ var marshalJSONTestCases = []struct {
 		},
 		result: `{"type":"InteropInterface","value":null}`,
 	},
+	{
+		input: Parameter{
+			Type:  ArrayType,
+			Value: []Parameter{},
+		},
+		result: `{"type":"Array","value":[]}`,
+	},
 }
 
 var marshalJSONErrorCases = []Parameter{
@@ -146,7 +153,7 @@ var marshalJSONErrorCases = []Parameter{
 
 func TestParam_MarshalJSON(t *testing.T) {
 	for _, tc := range marshalJSONTestCases {
-		res, err := json.Marshal(&tc.input)
+		res, err := json.Marshal(tc.input)
 		assert.NoError(t, err)
 		var actual, expected Parameter
 		assert.NoError(t, json.Unmarshal(res, &actual))