Wallet API: fix Cold signing split tx

1 files changed, 10 insertions, 4 deletions

diff --git a/src/wallet/api/unsigned_transaction.cpp b/src/wallet/api/unsigned_transaction.cpp
index b412084b0..1d9ef5d7c 100644
--- a/src/wallet/api/unsigned_transaction.cpp
+++ b/src/wallet/api/unsigned_transaction.cpp
@@ -104,6 +104,7 @@ bool UnsignedTransactionImpl::checkLoadedTx(const std::function<size_t()> get_nu
   size_t min_mixin = ~0;
   std::unordered_map<std::string, uint64_t> dests;
   const std::string wallet_address = m_wallet.m_wallet->get_account().get_public_address_str(m_wallet.m_wallet->testnet());
+  int first_known_non_zero_change_index = -1;
   for (size_t n = 0; n < get_num_txes(); ++n)
   {
     const tools::wallet2::tx_construction_data &cd = get_tx(n);
@@ -140,11 +141,16 @@ bool UnsignedTransactionImpl::checkLoadedTx(const std::function<size_t()> get_nu
         m_errorString = tr("Claimed change is larger than payment to the change address");
         return  false;
       }
-      if (memcmp(&cd.change_dts.addr, &get_tx(0).change_dts.addr, sizeof(cd.change_dts.addr)))
+      if (cd.change_dts.amount > 0)
       {
-        m_status = Status_Error;
-        m_errorString = tr("Change does to more than one address");
-        return false;
+        if (first_known_non_zero_change_index == -1)
+          first_known_non_zero_change_index = n;
+        if (memcmp(&cd.change_dts.addr, &get_tx(first_known_non_zero_change_index).change_dts.addr, sizeof(cd.change_dts.addr)))
+        {
+          m_status = Status_Error;
+          m_errorString = tr("Change goes to more than one address");
+          return false;
+        }
       }
       change += cd.change_dts.amount;
       it->second -= cd.change_dts.amount;