diff --git a/src/utils/MoneroUtils.cpp b/src/utils/MoneroUtils.cpp
index 98cdfe3..4f224a8 100644
--- a/src/utils/MoneroUtils.cpp
+++ b/src/utils/MoneroUtils.cpp
@@ -151,7 +151,7 @@ boost::property_tree::ptree MoneroUtils::toPropertyTree(const MoneroSubaddress&
 boost::property_tree::ptree MoneroUtils::txToPropertyTree(const MoneroTx& tx) {
   cout << "txToPropertyTree(tx)" << endl;
   boost::property_tree::ptree txNode;
-  if (tx.block != nullptr) txNode.put("id", *tx.id);
+  if (tx.block != nullptr) throw runtime_error("not implemented");
   if (tx.id != nullptr) txNode.put("id", *tx.id);
   if (tx.version != nullptr) txNode.put("version", *tx.version);
   if (tx.isCoinbase != nullptr) txNode.put("isCoinbase", *tx.isCoinbase);