From 4634fb3dabbcc777742e32bac9a05553358f8595 Mon Sep 17 00:00:00 2001
From: Charles Haley <cbhaley@i.wont.say.com>
Date: Thu, 1 Jun 2017 08:18:39 +0200
Subject: [PATCH] Fix #1694757: calibre fails to start if the tweak
 tag_browser_category_order is malformed.

---
 src/calibre/gui2/tag_browser/model.py | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/calibre/gui2/tag_browser/model.py b/src/calibre/gui2/tag_browser/model.py
index 1295aa5dea..64c830b7d0 100644
--- a/src/calibre/gui2/tag_browser/model.py
+++ b/src/calibre/gui2/tag_browser/model.py
@@ -994,7 +994,13 @@ class TagsModel(QAbstractItemModel):  # {{{
                 self.categories[category] = tb_categories[category]['name']
 
         # Now build the list of fields in display order
-        order = tweaks['tag_browser_category_order']
+        try:
+            order = tweaks['tag_browser_category_order']
+            if not isinstance(order, dict):
+                raise TypeError()
+        except:
+            print ('Tweak tag_browser_category_order is not valid. Ignored')
+            order = {'*': 100}
         defvalue = order.get('*', 100)
         self.row_map = sorted(self.categories, key=lambda x: order.get(x, defvalue))
         return data