From d0de1f377b64c394e34e3d33502d038d9c3aea15 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Sun, 28 May 2017 11:50:16 +0530
Subject: [PATCH] ...

---
 src/pyj/book_list/main.pyj | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/pyj/book_list/main.pyj b/src/pyj/book_list/main.pyj
index b90394ff92..e7b47ba5d7 100644
--- a/src/pyj/book_list/main.pyj
+++ b/src/pyj/book_list/main.pyj
@@ -33,7 +33,8 @@ def remove_initial_progress_bar():
         p.parentNode.removeChild(p)
 
 def onerror(msg, script_url, line_number, column_number, error_object):
-    console.log(error_object)
+    if error_object:
+        console.log(error_object)
     try:
         fname = script_url.rpartition('/')[-1] or script_url
         msg = msg + '<br><span style="font-size:smaller">' + 'Error at {}:{}:{}'.format(fname, line_number, column_number or '') + '</span>'