diff --git a/gui/qt/main_window.py b/gui/qt/main_window.py
index 7c383991..c14ab8ed 100644
--- a/gui/qt/main_window.py
+++ b/gui/qt/main_window.py
@@ -1163,7 +1163,6 @@ class ElectrumWindow(QMainWindow):
         def broadcast_thread():
             # non-GUI thread
             pr = self.payment_request
-            key = pr.get_id()
             if pr is None:
                 return self.wallet.sendtx(tx)
             if pr.has_expired():
@@ -1172,6 +1171,7 @@ class ElectrumWindow(QMainWindow):
             status, msg =  self.wallet.sendtx(tx)
             if not status:
                 return False, msg
+            key = pr.get_id()
             self.invoices.set_paid(key, tx.hash())
             self.payment_request = None
             refund_address = self.wallet.addresses()[0]
diff --git a/gui/qt/transaction_dialog.py b/gui/qt/transaction_dialog.py
index f90fdb0a..af76b05b 100644
--- a/gui/qt/transaction_dialog.py
+++ b/gui/qt/transaction_dialog.py
@@ -178,6 +178,7 @@ class TxDialog(QDialog):
 
         # if we are not synchronized, we cannot tell
         if self.parent.network is None or not self.parent.network.is_running() or not self.parent.network.is_connected():
+            self.broadcast_button.hide()  # cannot broadcast when offline
             return
         if not self.wallet.up_to_date:
             return