From 7a930a8e1176767bb5e2591e0fc0d997a082e89f Mon Sep 17 00:00:00 2001
From: Roman Khimov <roman@nspcc.ru>
Date: Wed, 24 Aug 2022 15:36:52 +0300
Subject: [PATCH] wallet: don't fail in SignTx when no contract provided

Unfortunately valid NEP-6 can have no contract inside of account, so this
should be accounted for.
---
 pkg/wallet/account.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pkg/wallet/account.go b/pkg/wallet/account.go
index 7b1619707..fff9dde7b 100644
--- a/pkg/wallet/account.go
+++ b/pkg/wallet/account.go
@@ -84,6 +84,9 @@ func NewAccount() (*Account, error) {
 
 // SignTx signs transaction t and updates it's Witnesses.
 func (a *Account) SignTx(net netmode.Magic, t *transaction.Transaction) error {
+	if a.Contract == nil {
+		return errors.New("account has no contract")
+	}
 	if len(a.Contract.Parameters) == 0 {
 		if len(t.Signers) != len(t.Scripts) { // Sequential signing vs. existing scripts.
 			t.Scripts = append(t.Scripts, transaction.Witness{})