Comment 2 for bug 2071520

Same. Adding that using the Shift-Alt-M.

alibre 7.13 embedded-python: True
Linux-6.1.21-v8+-aarch64-with-glibc2.36 Linux ('64bit', 'ELF')
('Linux', '6.1.21-v8+', '#1642 SMP PREEMPT Mon Apr 3 17:24:16 BST 2023')
Python 3.11.5
Interface language: None
EXE path: /opt/calibre/bin/calibre-debug
Successfully initialized third party plugins: Gather KFX-ZIP (from KFX Input) (2, 15, 0) && Package KFX (from KFX Input) (2, 15, 0) && Count Pages (1, 13, 6) && Extract ISBN (1, 6, 3) && Find Duplicates (1, 10, 9) && Generate Cover (2, 3, 4) && Goodreads (1, 8, 2) && ISFDB3 (1, 4, 0) && Job Spy (1, 0, 239) && KFX metadata reader (from KFX Input) (2, 15, 0) && From KFX (2, 15, 0) && KFX Input (2, 15, 0) && Library Codes (1, 0, 65)
Traceback (most recent call last):
  File "calibre/gui2/actions/edit_metadata.py", line 644, in merge_books
TypeError: cannot unpack non-iterable bool object