Catalog generation: Handle merge of comments + custom field when custom filed is None

2025-07-09 03:04:10 -04:00 · 2011-01-02 12:01:52 -07:00 · 2011-01-02 12:01:52 -07:00 · c34e9fd7f8
commit c34e9fd7f8
parent 9515a4d5e1 01469303ab
1 changed files with 2 additions and 0 deletions
--- a/src/calibre/library/catalog.py
+++ b/src/calibre/library/catalog.py
@ -4826,6 +4826,8 @@ class EPUB_MOBI(CatalogPlugin):
                addendum = self.__db.get_field(record['id'],
                                            self.__merge_comments['field'],
                                            index_is_id=True)
+                if addendum is None:
+                    addendum = ''
                include_hr = eval(self.__merge_comments['hr'])
                if self.__merge_comments['position'] == 'before':
                    merged = addendum