From 3584a8f0048d13ffb31f5635608a7593217348e9 Mon Sep 17 00:00:00 2001
From: Damien Elmes <git@ichi2.net>
Date: Fri, 1 Mar 2013 14:53:00 +0900
Subject: [PATCH] fix "free variable 'mw'" error (#284)

---
 aqt/downloader.py | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/aqt/downloader.py b/aqt/downloader.py
index b0437bed7..e8ebb211d 100644
--- a/aqt/downloader.py
+++ b/aqt/downloader.py
@@ -20,7 +20,14 @@ def download(mw, code):
     # create downloading thread
     thread = Downloader(code)
     def onRecv():
-        mw.progress.update(label="%dKB downloaded" % (thread.recvTotal/1024))
+        try:
+            mw.progress.update(label="%dKB downloaded" % (thread.recvTotal/1024))
+        except NameError:
+            # some users report the following error on long downloads
+            # NameError: free variable 'mw' referenced before assignment in enclosing scope
+            # unsure why this is happening, but guard against throwing the
+            # error
+            pass
     mw.connect(thread, SIGNAL("recv"), onRecv)
     thread.start()
     mw.progress.start(immediate=True)