From de969af505aeaf32507c19229081371a850549b9 Mon Sep 17 00:00:00 2001
From: Charles Haley <>
Date: Sun, 22 May 2011 20:12:47 +0100
Subject: [PATCH] Improve robustness in column coloring.

---
 src/calibre/gui2/library/models.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/calibre/gui2/library/models.py b/src/calibre/gui2/library/models.py
index 6e8e79d3b3..9d90c44f18 100644
--- a/src/calibre/gui2/library/models.py
+++ b/src/calibre/gui2/library/models.py
@@ -715,7 +715,8 @@ class BooksModel(QAbstractTableModel): # {{{
                 fmt = self.column_color_map[key]
                 try:
                     color = composite_formatter.safe_format(fmt, mi, '', mi)
-                    return QColor(color)
+                    if QColor.isValid(color):
+                        return QColor(color)
                 except:
                     return None
             elif self.is_custom_column(key) and \