diff --git a/components/brave_wallet/browser/solana_transaction_unittest.cc b/components/brave_wallet/browser/solana_transaction_unittest.cc
index fc86d5ec8c83..97b609b76e8e 100644
--- a/components/brave_wallet/browser/solana_transaction_unittest.cc
+++ b/components/brave_wallet/browser/solana_transaction_unittest.cc
@@ -315,13 +315,7 @@ TEST_F(SolanaTransactionUnitTest, FromSignedTransactionBytes) {
        67,  136, 209, 219, 42,  6,   169, 240, 137, 142, 185, 169, 6,   17,
        87,  123, 6,   42,  55,  162, 64,  120, 91,  1,   2,   2,   0,   1,
        12,  2,   0,   0,   0,   128, 150, 152, 0,   0,   0,   0,   0});
-  const std::vector<uint8_t> empty_signatures(
-      {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0});
+  const std::vector<uint8_t> empty_signatures(128, 0);
 
   for (size_t i = 1; i < valid_signed_tx_with_two_signer.size(); ++i) {
     EXPECT_FALSE(SolanaTransaction::FromSignedTransactionBytes(
diff --git a/components/brave_wallet/browser/solana_tx_manager.cc b/components/brave_wallet/browser/solana_tx_manager.cc
index e6a6399f8040..36652b1aadfd 100644
--- a/components/brave_wallet/browser/solana_tx_manager.cc
+++ b/components/brave_wallet/browser/solana_tx_manager.cc
@@ -380,6 +380,13 @@ void SolanaTxManager::MakeTxDataFromBase64EncodedTransaction(
 
   auto transaction =
       SolanaTransaction::FromSignedTransactionBytes(*transaction_bytes);
+  if (!transaction) {
+    std::move(callback).Run(
+        nullptr, mojom::SolanaProviderError::kInternalError,
+        l10n_util::GetStringUTF8(IDS_WALLET_INTERNAL_ERROR));
+    return;
+  }
+
   transaction->set_tx_type(std::move(tx_type));
 
   if (send_options) {
diff --git a/components/brave_wallet/browser/solana_tx_manager_unittest.cc b/components/brave_wallet/browser/solana_tx_manager_unittest.cc
index d4859a01bbba..e47034444431 100644
--- a/components/brave_wallet/browser/solana_tx_manager_unittest.cc
+++ b/components/brave_wallet/browser/solana_tx_manager_unittest.cc
@@ -802,6 +802,12 @@ TEST_F(SolanaTxManagerUnitTest, MakeTxDataFromBase64EncodedTransaction) {
       "not a base64 message", mojom::TransactionType::SolanaSwap, nullptr,
       nullptr, mojom::SolanaProviderError::kInternalError,
       l10n_util::GetStringUTF8(IDS_WALLET_INTERNAL_ERROR));
+
+  // KO: valid base64 message, but invalid transaction bytes
+  TestMakeTxDataFromBase64EncodedTransaction(
+      "YW5p", mojom::TransactionType::SolanaSwap, nullptr, nullptr,
+      mojom::SolanaProviderError::kInternalError,
+      l10n_util::GetStringUTF8(IDS_WALLET_INTERNAL_ERROR));
 }
 
 TEST_F(SolanaTxManagerUnitTest, GetEstimatedTxFee) {