diff --git a/ankiqt/ui/view.py b/ankiqt/ui/view.py
index bebf805b2..54155d0de 100644
--- a/ankiqt/ui/view.py
+++ b/ankiqt/ui/view.py
@@ -133,6 +133,9 @@ class View(object):
             playFromText(q)
 	
     def correct(self, a, b):
+        if b == "":
+            return "";
+
         ret = "";
         s = difflib.SequenceMatcher(None, b, a)