[alumoi]

Ahem, me again.
While searching for metadata variations using series I encountered the following error: TypeError: NoneType object is not iterable.

calibre 6.5 embedded-python: True
Windows-10-10.0.19044-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.19044')
Python 3.10.1
Windows: ('10', '10.0.19044', 'SP0', 'Multiprocessor Free')
Interface language: None
Successfully initialized third party plugins: Gather KFX-ZIP (from KFX Input) (1, 49, 0) && DeDRM (7, 2, 1) && Package KFX (from KFX Input) (1, 49, 0) && Barnes & Noble (1, 4, 0) && Clean Metadata (0, 0, 6) && Extract ISBN (1, 6, 0) && Fantastic Fiction (1, 6, 0) && Fantastic Fiction Adults (1, 3, 0) && Find Duplicates (1, 10, 5) && Goodreads (1, 7, 1) && ISFDB (3, 0, 0) && KFX metadata reader (from KFX Input) (1, 49, 0) && KFX Input (1, 49, 0) && Kindle Collections (1, 7, 29) && Obok DeDRM (7, 2, 1) && Quality Check (1, 13, 0) && Smashwords Metadata (1, 0, 2)
Traceback (most recent call last):
File "calibre_plugins.find_duplicates.dialogs", line 780, in _refresh_results
File "calibre_plugins.find_duplicates.variation_algorit hms", line 29, in run_variation_check
File "calibre_plugins.find_duplicates.variation_algorit hms", line 58, in _get_items_to_consider
File "calibre_plugins.find_duplicates.matching", line 41, in get_field_pairs
File "calibre_plugins.find_duplicates.matching", line 26, in ids_for_field
TypeError: 'NoneType' object is not iterable

NOTE: author variations works great