[MerryEl]

Yesterday, I updated Calibre to version 7.13 on my Windows 11 machine. Now, I am seeing an error message whenever I try to merge two ebooks. At the same time, all the plug-in's were reporting as up to date. Help?

I copied the following message to my clipboard.

calibre, version 7.13.0
ERROR: Unhandled exception: <b>TypeError</b>:cannot unpack non-iterable bool object

calibre 7.13 embedded-python: True
Windows-10-10.0.22631-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.22631')
Python 3.11.5
Windows: ('10', '10.0.22631', 'SP0', 'Multiprocessor Free')
Interface language: None
EXE path: C:\Program Files\Calibre2\calibre.exe
Successfully initialized third party plugins: DeDRM (7, 2, 1) && BBC GoodFood Recipe Reader (1, 1, 0) && Barnes & Noble (1, 5, 5) && BigOven Recipe Reader (1, 0, 1) && Clean Comments (0, 2, 1) && Clean Metadata (0, 0, 6) && Comicvine (0, 14, 2) && DOC Input (1, 0, 1) && Embed Comic Metadata (1, 6, 6) && EpubSplit (3, 7, 0) && Extract ISBN (1, 6, 3) && Find Duplicates (1, 10, 9) && Generate Cover (2, 3, 4) && Goodreads (1, 8, 2) && Goodreads More Tags (1, 2, 1) && ISFDB3 (1, 4, 0) && Job Spy (1, 0, 239) && Kindle Collections (1, 7, 29) && Kindle hi-res covers (0, 5, 1) && Kobo Books (1, 9, 2) && Last Modified (0, 8, 5) && Library Codes (1, 0, 65) && Mass Search-Replace (1, 8, 2) && Obok DeDRM (7, 2, 1) && PDF Cover (0, 1, 0) && Quality Check (1, 13, 10) && Quick Preferences (1, 7, 1) && Recipe Reader (1, 0, 1) && Reformat plugin (2, 4, 0) && Resize Cover (1, 2, 1) && Search The Internet (1, 11, 2) && Sony PRS-T1 notes plugin (1, 1, 0) && Wiki Reader (2, 2, 1) && all recipes Recipe Reader (1, 0, 2) && food network Recipe Reader (1, 0, 2)
Traceback (most recent call last):
File "calibre\gui2\actions\edit_metadata.py", line 644, in merge_books
TypeError: cannot unpack non-iterable bool object