From 4ed67af5f20de7338bcc490efb1d8394fbbc719f Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Mon, 19 Mar 2018 09:19:04 +0530
Subject: [PATCH] Fix #1756732 [uncaught error column
 bar](https://bugs.launchpad.net/calibre/+bug/1756732)

---
 src/calibre/gui2/library/views.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/calibre/gui2/library/views.py b/src/calibre/gui2/library/views.py
index 8f4cc44e01..65affabaf8 100644
--- a/src/calibre/gui2/library/views.py
+++ b/src/calibre/gui2/library/views.py
@@ -462,6 +462,7 @@ class BooksView(QTableView):  # {{{
     def show_column_header_context_menu(self, pos, view=None):
         view = view or self
         idx = view.column_header.logicalIndexAt(pos)
+        col = None
         if idx > -1 and idx < len(self.column_map):
             col = self.column_map[idx]
             name = unicode(self.model().headerData(idx, Qt.Horizontal, Qt.DisplayRole) or '')