diff --git a/electrum/gui/qt/send_tab.py b/electrum/gui/qt/send_tab.py
index 2cbcdec9c..b3bdbd60e 100644
--- a/electrum/gui/qt/send_tab.py
+++ b/electrum/gui/qt/send_tab.py
@@ -1002,3 +1002,5 @@ class SendTab(QWidget, MessageBoxMixin, Logger):
             self.window.run_coroutine_dialog(coro, _("Requesting lightning withdrawal..."))
         except LNURLError as e:
             self.show_error(f"{_('Failed to request withdrawal')}:\n{str(e)}")
+        except UserCancelled:
+            pass
diff --git a/electrum/lnurl.py b/electrum/lnurl.py
index 9bfd0592f..a95bf8bcc 100644
--- a/electrum/lnurl.py
+++ b/electrum/lnurl.py
@@ -179,7 +179,7 @@ def _parse_lnurl3_response(lnurl_response: dict) -> LNURL3Data:
         raise UntrustedLNURLError(f"Missing k1 value in LNURL3 response: {lnurl_response=}")
     default_description = lnurl_response.get('defaultDescription', '')
     try:
-        min_withdrawable_sat = int(lnurl_response['minWithdrawable']) // 1000
+        min_withdrawable_sat = int(lnurl_response['minWithdrawable'] or 0) // 1000
         max_withdrawable_sat = int(lnurl_response['maxWithdrawable']) // 1000
         assert max_withdrawable_sat >= min_withdrawable_sat, f"Invalid amounts: max < min amount"
         assert max_withdrawable_sat > 0, f"Invalid max amount: {max_withdrawable_sat} sat"