diff --git a/apps/amm/src/AmmUiBackend.cpp b/apps/amm/src/AmmUiBackend.cpp
index f03b7dd..3d2e187 100644
--- a/apps/amm/src/AmmUiBackend.cpp
+++ b/apps/amm/src/AmmUiBackend.cpp
@@ -215,6 +215,7 @@ void AmmUiBackend::syncWalletState()
     if (addressChanged) {
         m_identityRetryTimer->stop();
         m_pendingTransactions.clear();
+        m_transactionPollsInFlight.clear();
         m_transactionTimer->stop();
         m_network.sequencerChanged(!state.sequencerAddress.isEmpty());
     }
@@ -327,8 +328,12 @@ void AmmUiBackend::pollTransactions()
             m_pendingTransactions.remove(transaction.nativeHash);
             continue;
         }
+        if (m_transactionPollsInFlight.contains(transaction.nativeHash))
+            continue;
+        m_transactionPollsInFlight.insert(transaction.nativeHash);
         m_sequencer->queryTransaction(transaction.nativeHash,
             [this, transaction](bool ok, bool included) {
+                m_transactionPollsInFlight.remove(transaction.nativeHash);
                 if (!ok || !included
                     || !m_pendingTransactions.contains(transaction.nativeHash)) {
                     return;
diff --git a/apps/amm/src/AmmUiBackend.h b/apps/amm/src/AmmUiBackend.h
index c5bf160..041a495 100644
--- a/apps/amm/src/AmmUiBackend.h
+++ b/apps/amm/src/AmmUiBackend.h
@@ -5,6 +5,7 @@
 
 #include <QObject>
 #include <QHash>
+#include <QSet>
 #include <QString>
 #include <QStringList>
 #include <QVariant>
@@ -86,6 +87,7 @@ private:
         qint64 deadlineMs = 0;
     };
     QHash<QString, PendingTransaction> m_pendingTransactions;
+    QSet<QString> m_transactionPollsInFlight;
 };
 
 #endif // AMM_UI_BACKEND_H