From f3a6472c5c8d70d2796211ae6322b68ec1295b27 Mon Sep 17 00:00:00 2001
From: Damien Elmes <gpg@ankiweb.net>
Date: Wed, 26 Sep 2018 16:31:31 +1000
Subject: [PATCH] fix error when review button deselected

https://anki.tenderapp.com/discussions/ankidesktop/29882-selecting-a-button-and-enter-or-space-always-chooses-good
---
 aqt/reviewer.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/aqt/reviewer.py b/aqt/reviewer.py
index 088146935..05587d792 100644
--- a/aqt/reviewer.py
+++ b/aqt/reviewer.py
@@ -277,7 +277,7 @@ The front of this card is empty. Please run Tools>Empty Cards.""")
 
     def _onAnswerButton(self, val):
         # button selected?
-        if val in "1234":
+        if val and val in "1234":
             self._answerCard(int(val))
         else:
             self._answerCard(self._defaultEase())