From 57859371e8851b1333237183dd4839d49ab51e8f Mon Sep 17 00:00:00 2001
From: Adina Wagner <adina.wagner@t-online.de>
Date: Fri, 26 Jun 2026 08:54:40 +0200
Subject: [PATCH] Fix: robustify against KeyError

---
 filters/enrich-via-doi.py | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/filters/enrich-via-doi.py b/filters/enrich-via-doi.py
index 30403ce..43b529c 100644
--- a/filters/enrich-via-doi.py
+++ b/filters/enrich-via-doi.py
@@ -208,8 +208,7 @@ def publishing_process(d: dict) -> dict[str, str] | None:
     if (pubdate := csl_publish_date(d)) is not None:
         has_detail = True
         res["at_time"] = pubdate
-
-    if (issn := d["ISSN"]) is not None:
+    if (issn := d.get("ISSN", None)) is not None:
         has_detail = True
         # there can be more than one (e.g. different for print / online)
         # if that's the case, use the 1st - we have no more data at hand
-- 
2.52.0