From 8f9a20c5a57b5ed71dc79c5026da0288c28642a6 Mon Sep 17 00:00:00 2001
From: Damien Elmes <git@ichi2.net>
Date: Sat, 7 Apr 2012 17:11:32 +0900
Subject: [PATCH] fix 'null' error when closing browser etc

---
 aqt/editor.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/aqt/editor.py b/aqt/editor.py
index 845f70ad4..e7560fce8 100644
--- a/aqt/editor.py
+++ b/aqt/editor.py
@@ -133,6 +133,10 @@ function onBlur() {
 };
 
 function saveField(type) {
+    if (!currentField) {
+        // no field has been focused yet
+        return;
+    }
     // type is either 'blur' or 'key'
     py.run(type + ":" + currentField.innerHTML);
     clearChangeTimer();