diff --git a/electrum/gui/qml/components/WalletMainView.qml b/electrum/gui/qml/components/WalletMainView.qml
index 76123d99c..bfdb9f522 100644
--- a/electrum/gui/qml/components/WalletMainView.qml
+++ b/electrum/gui/qml/components/WalletMainView.qml
@@ -485,7 +485,7 @@ Item {
             var dialog = app.messageDialog.createObject(app, {
                 title: qsTr('Error'),
                 iconSource: Qt.resolvedUrl('../../icons/warning.png'),
-                text: message
+                text: message ? message : qsTr('Payment failed')
             })
             dialog.open()
         }
diff --git a/electrum/gui/qml/components/main.qml b/electrum/gui/qml/components/main.qml
index daade9c63..e89afc227 100644
--- a/electrum/gui/qml/components/main.qml
+++ b/electrum/gui/qml/components/main.qml
@@ -613,10 +613,10 @@ ApplicationWindow
         }
         // TODO: add to notification queue instead of barging through
         function onPaymentSucceeded(key) {
-            notificationPopup.show(Daemon.currentWallet.name, qsTr('Payment Succeeded'))
+            notificationPopup.show(Daemon.currentWallet.name, qsTr('Payment succeeded'))
         }
         function onPaymentFailed(key, reason) {
-            notificationPopup.show(Daemon.currentWallet.name, qsTr('Payment Failed') + ': ' + reason)
+            notificationPopup.show(Daemon.currentWallet.name, qsTr('Payment failed') + ': ' + reason)
         }
     }