diff --git a/utt/include/transaction.hpp b/utt/include/transaction.hpp
index 7e7d317250..d0283b5916 100644
--- a/utt/include/transaction.hpp
+++ b/utt/include/transaction.hpp
@@ -89,4 +89,13 @@ class Transaction {
   struct Impl;
   Impl* pImpl_;
 };
-}  // namespace libutt::api::operations
\ No newline at end of file
+
+class InvalidCoinsInTransfer : public std::exception {
+ public:
+  explicit InvalidCoinsInTransfer(const std::string& what) : msg(what){};
+  virtual const char* what() const noexcept override { return msg.c_str(); }
+
+ private:
+  std::string msg;
+};
+}  // namespace libutt::api::operations
diff --git a/utt/privacy-wallet-service/include/PrivacyService.hpp b/utt/privacy-wallet-service/include/PrivacyService.hpp
index 50f026c1dc..e7edec2677 100644
--- a/utt/privacy-wallet-service/include/PrivacyService.hpp
+++ b/utt/privacy-wallet-service/include/PrivacyService.hpp
@@ -22,6 +22,7 @@
 #include "Wallet.hpp"
 #include <storage/IStorage.hpp>
 #include <utt-client-api/ClientApi.hpp>
+#include <transaction.hpp>
 
 namespace utt::walletservice {
 //@TODO hide on its own file..
@@ -106,4 +107,4 @@ class PrivacyWalletService {
   std::unique_ptr<grpc::Server> grpc_server_;
   std::unique_ptr<PrivacyWalletServiceImpl> privacy_wallet_service_;
 };
-}  // namespace utt::walletservice
\ No newline at end of file
+}  // namespace utt::walletservice
diff --git a/utt/privacy-wallet-service/proto/api/v1/wallet-api.proto b/utt/privacy-wallet-service/proto/api/v1/wallet-api.proto
index 1624a1698a..1dd1eaf9f3 100644
--- a/utt/privacy-wallet-service/proto/api/v1/wallet-api.proto
+++ b/utt/privacy-wallet-service/proto/api/v1/wallet-api.proto
@@ -69,6 +69,7 @@ message ClaimCoinsRequest {
 
 message ClaimCoinsReponse {
     bool succ = 1;
+    string warning = 2;
 }
 
 message GenerateMintTx {
@@ -154,4 +155,4 @@ message PrivacyWalletResponse {
         SetAppDataResponse set_app_data_response = 9;
         GetAppDataResponse get_app_data_response = 10;
     }
-}
\ No newline at end of file
+}
diff --git a/utt/privacy-wallet-service/src/PrivacyService.cpp b/utt/privacy-wallet-service/src/PrivacyService.cpp
index 2abe63539f..3fd9fa6806 100644
--- a/utt/privacy-wallet-service/src/PrivacyService.cpp
+++ b/utt/privacy-wallet-service/src/PrivacyService.cpp
@@ -275,14 +275,16 @@ ::grpc::Status PrivacyWalletServiceImpl::handleUserClaimCoinsRequest(::grpc::Ser
       response->set_err(err_msg);
       return grpc::Status(grpc::StatusCode::ABORTED, err_msg);
     }
+  } catch (const libutt::api::operations::InvalidCoinsInTransfer& e) {
+    std::cout << e.what() << std::endl;
+    response->mutable_claim_coins_response()->set_warning(e.what());
   } catch (const std::exception& e) {
     std::cout << e.what() << std::endl;
     response->set_err(e.what());
     return grpc::Status(grpc::StatusCode::ABORTED, e.what());
   }
   if (response) {
-    auto resp = response->mutable_claim_coins_response();
-    resp->set_succ(true);
+    response->mutable_claim_coins_response()->set_succ(true);
   }
   return grpc::Status::OK;
 }
@@ -428,4 +430,4 @@ ::grpc::Status PrivacyWalletServiceImpl::handleGetAppDataRequest(
   return grpc::Status::OK;
 }
 
-}  // namespace utt::walletservice
\ No newline at end of file
+}  // namespace utt::walletservice
diff --git a/utt/utt-client-api/src/User.cpp b/utt/utt-client-api/src/User.cpp
index 4093e920e1..d2bb992a7e 100644
--- a/utt/utt-client-api/src/User.cpp
+++ b/utt/utt-client-api/src/User.cpp
@@ -447,9 +447,13 @@ void User::updateTransferTx(const Transaction& tx, const TxOutputSigs& sigs) {
 
     // Claim coins
     auto claimedCoins = pImpl_->client_->claimCoins(uttTx, pImpl_->params_, sigs);
-
+    bool invalidCoinsInTransfer(false);
     for (auto& coin : claimedCoins) {
-      if (!pImpl_->client_->validate(coin)) throw std::runtime_error("Invalid normal coin in transfer!");
+      if (!pImpl_->client_->validate(coin)) {
+        logdbg_user << "Invalid coin found; coin details: " << dbgPrintCoins({coin}) << endl;
+        invalidCoinsInTransfer = true;
+        continue;
+      }
       pImpl_->storage_->setCoin(coin);
       if (coin.getType() == libutt::api::Coin::Type::Normal) {
         logdbg_user << "claimed normal coin: " << dbgPrintCoins({coin}) << endl;
@@ -464,6 +468,9 @@ void User::updateTransferTx(const Transaction& tx, const TxOutputSigs& sigs) {
         }
       }
     }
+    if (invalidCoinsInTransfer) {
+      throw libutt::api::operations::InvalidCoinsInTransfer("Invalid normal coin(s) in transfer!");
+    }
   }
 }
 
@@ -617,4 +624,4 @@ void User::debugOutput() const {
   std::cout << "------ USER DEBUG OUTPUT END -------------\n";
 }
 
-}  // namespace utt::client
\ No newline at end of file
+}  // namespace utt::client