diff --git a/main.qml b/main.qml
index 845af5bd..73026866 100644
--- a/main.qml
+++ b/main.qml
@@ -980,7 +980,7 @@ ApplicationWindow {
 
     // called on "getProof"
     function handleGetProof(txid, address, message, amount) {
-        if (amount.length > 0) {
+        if (amount !== null && amount.length > 0) {
             var result = currentWallet.getReserveProof(false, currentWallet.currentSubaddressAccount, walletManager.amountFromString(amount), message)
             txProofComputed(null, result)
         } else {
diff --git a/pages/History.qml b/pages/History.qml
index efdf5931..48befeaa 100644
--- a/pages/History.qml
+++ b/pages/History.qml
@@ -1720,7 +1720,7 @@ Rectangle {
         }
 
         console.log("getProof: Generate clicked: txid " + hash + ", address " + address);
-        middlePanel.getProofClicked(hash, address, '');
+        middlePanel.getProofClicked(hash, address, '', null);
         informationPopup.title  = qsTr("Payment proof") + translationManager.emptyString;
         informationPopup.text = qsTr("Generating payment proof") + "..." + translationManager.emptyString;
         informationPopup.onCloseCallback = null