fix #4047

7 years ago · 3a5a0af48f
1 changed files with 1 additions and 1 deletions
--- a/gui/qt/main_window.py
+++ b/gui/qt/main_window.py
@ -664,7 +664,7 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
            fiat_e.is_last_edited = (edit == fiat_e)
            amount = edit.get_amount()
            rate = self.fx.exchange_rate() if self.fx else None
-            if rate is None or amount is None:
+            if rate.is_nan() or amount is None:
                if edit is fiat_e:
                    btc_e.setText("")
                    if fee_e: