Edit Metadata individually throws error

[Karolin]

When I try to edit metadata individually I directly get this error when I click on "Edit Metadata individually". It first appeared with the new calibre version 6.19, which I installed this morning.

calibre, version 6.19.0
ERROR: Unhandled exception: <b>TypeError</b>:'str' object is not callable

calibre 6.19 embedded-python: True
Windows-10-10.0.22000-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.22000')
Python 3.10.1
Windows: ('10', '10.0.22000', 'SP0', 'Multiprocessor Free')
Interface language: None
Successfully initialized third party plugins: DeDRM (10, 0, 3) && Count Pages (1, 13, 0) && EpubSplit (3, 6, 0) && Goodreads Sync (1, 16, 3) && Set KFX metadata (from KFX Output) (1, 67, 0) && KFX Output (1, 67, 0) && Modify ePub (1, 8, 1) && Obok DeDRM (7, 2, 1) && User Category (1, 6, 0) && ePub Extended Metadata {Writer} (0, 9, 0) && ePub Extended Metadata {Reader} (0, 9, 0) && ePub Extended Metadata (0, 9, 0)
Traceback (most recent call last):
  File "calibre\gui2\actions\edit_metadata.py", line 438, in edit_metadata
  File "calibre\gui2\actions\edit_metadata.py", line 461, in edit_metadata_for
  File "calibre\gui2\actions\edit_metadata.py", line 491, in do_edit_metadata
  File "calibre\gui2\metadata\single.py", line 1274, in edit_metadata
  File "calibre\gui2\metadata\single.py", line 71, in __init__
  File "calibre\gui2\metadata\single.py", line 116, in setupUi
  File "calibre\gui2\metadata\single.py", line 207, in create_basic_metadata_widgets
  File "calibre\gui2\metadata\basic_widgets.py", line 706, in __init__
  File "calibre\gui2\metadata\basic_widgets.py", line 709, in enable
  File "calibre\gui2\metadata\basic_widgets.py", line 634, in current_val
TypeError: 'str' object is not callable