From 9ff084ff106b955d5dcc9ceb3b31ba4c1f0d46c5 Mon Sep 17 00:00:00 2001
From: Stefan Huber <shuber@sthu.org>
Date: Fri, 11 Nov 2022 15:29:25 +0100
Subject: [PATCH] bib2html: Sanitize bibentry sort without month

---
 bib2html.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/bib2html.py b/bib2html.py
index 64286f2..72a5771 100755
--- a/bib2html.py
+++ b/bib2html.py
@@ -136,11 +136,16 @@ def entryDateSortKey(p):
             'apr' : '04', 'may' : '05', 'jun' : '06', \
             'jul' : '07', 'aug' : '08', 'sep' : '09', \
             'oct' : '10', 'nov' : '11', 'dec' : '12'}
+
+    if not 'month' in e.fields:
+        return e.fields['year']
+
     month = e.fields['month'].lower()[0:3]
     if month in month2num:
         month = month2num[month]
     else:
         month = ""
+
     return e.fields['year'] + "-" + month
 
 
-- 
2.30.2