From a539f24a0af955b2dcde29e9b277e28a86d313e6 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Wed, 5 Feb 2020 07:33:10 +0530
Subject: [PATCH] Catalog generation: Ignore invalid pubdates

---
 src/calibre/library/catalogs/epub_mobi_builder.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/calibre/library/catalogs/epub_mobi_builder.py b/src/calibre/library/catalogs/epub_mobi_builder.py
index 2ffe46a6bf..02e4050456 100644
--- a/src/calibre/library/catalogs/epub_mobi_builder.py
+++ b/src/calibre/library/catalogs/epub_mobi_builder.py
@@ -2746,7 +2746,10 @@ class CatalogBuilder(object):
         # Date of publication
         if book['date']:
             pubdate = book['date']
-            pubmonth, pubyear = pubdate.split()
+            try:
+                pubmonth, pubyear = pubdate.split()
+            except Exception:
+                pubmonth = pubyear = ''
         else:
             pubdate = pubyear = pubmonth = ''