diff --git a/electrum/gui/kivy/main_window.py b/electrum/gui/kivy/main_window.py
index 544be0c61..709e8b73a 100644
--- a/electrum/gui/kivy/main_window.py
+++ b/electrum/gui/kivy/main_window.py
@@ -260,7 +260,7 @@ class ElectrumWindow(App, Logger):
         req = self.wallet.get_invoice(key)
         if req is None:
             return
-        status = self.wallet.get_invoice_status(invoice)
+        status = self.wallet.get_invoice_status(req)
         if self.send_screen:
             if status == PR_PAID:
                 self.send_screen.update()