Check Library produces NoneType error

[Disabled Reader]

The following error occurs when trying to run 'Check Library' causing the program to become unresponsive and requires an end task.

calibre, version 7.23.0
ERROR: Unhandled exception: <b>AttributeError</b>:'NoneType' object has no attribute 'library_id'

calibre 7.23 embedded-python: True
Windows-10-10.0.26100-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.26100')
Python 3.11.5
Windows: ('10', '10.0.26100', 'SP0', 'Multiprocessor Free')
Interface language: None
EXE path: C:\Program Files\Calibre eBook Manager\calibre.exe
Successfully initialized third party plugins: DeACSM (0, 0, 16) && Gather KFX-ZIP (from KFX Input) (2, 18, 0) && DeDRM (10, 0, 9) && Package KFX (from KFX Input) (2, 18, 0) && Barnes & Noble (1, 5, 6) && Count Pages (1, 13, 6) && EpubSplit (3, 9, 0) && Fantastic Fiction (1, 7, 1) && Favourites Menu (1, 3, 1) && FictionDB (1, 4, 2) && Generate Cover (2, 3, 4) && Goodreads (1, 8, 2) && Goodreads Sync (1, 16, 11) && KFX metadata reader (from KFX Input) (2, 18, 0) && From KFX (2, 18, 0) && KFX Input (2, 18, 0) && Quality Check (1, 13, 16) && View Manager (1, 10, 3)
Traceback (most recent call last):
  File "calibre\gui2\actions\choose_library.py", line 692, in check_library
  File "calibre\gui2\ui.py", line 986, in library_moved
  File "calibre\gui2\ui.py", line 1176, in _save_tb_state
AttributeError: 'NoneType' object has no attribute 'library_id'

[Charles Haley (cbhaley)]

NB: You can avoid this error by unchecking the new option Preferences / Look & feel / Tag browser / Expand tree to show last used item.

[Kovid Goyal (kovid)]

Fixed in branch master. The fix will be in the next release. calibre is usually released every alternate Friday.