PGadmin V4.17 - Windows 10 - Can not create select, update scripts for table "Error message" error fetching SQl for script: 'attname' - pgadmin-4

Question

I am running Pgadmin V4.17 on Windows 10.
When I try to create a select or update sql statement for a table(with the right click on table Scripts) I got an Error window with the text "Error message" and with the caption text :Error fetching SQL for script 'attname'.
The error appears on all PG databases, local or remote.
My environment as displayed by the Help is:
Version 4.17 Copyright Copyright (C) 2013 - 2020, The pgAdmin Development Team Python Version
3.7.3 (v3.7.3:ef4ec6ed12, Mar 25 2019, 21:26:53) [MSC v.1916 32 bit (Intel)] Flask Version
1.0.2 Application Mode Desktop Current User pgadmin4#pgadmin.org
The last pgadmin log lines are:
*2020-01-27 17:05:32,389: ERROR flask.app: 'attname' Traceback (most recent call last): File
"C:/app/pgAdmin4/v4/venv/Lib/site-packages\flask\app.py", line 1813,
in full_dispatch_request
rv = self.dispatch_request() File "C:/app/pgAdmin4/v4/venv/Lib/site-packages\flask\app.py", line 1799,
in dispatch_request
return self.view_functionsrule.endpoint File "C:/app/pgAdmin4/v4/venv/Lib/site-packages\flask\views.py", line 88,
in view
return self.dispatch_request(*args, **kwargs) File "C:\app\pgAdmin4\v4\web\pgadmin\browser\utils.py", line 311, in
dispatch_request
return method(*args, **kwargs) File "C:\app\pgAdmin4\v4\web\pgadmin\browser\server_groups\servers\databases\schemas\tables\utils.py",
line 141, in wrap
return f(*args, **kwargs) File "C:\app\pgAdmin4\v4\web\pgadmin\browser\server_groups\servers\databases\schemas\tables__init__.py",
line 1310, in select_sql
columns.append(self.qtIdent(self.conn, c['attname'])) KeyError: 'attname'*
I can write the SQL selects and run them but not generating them.
Any idea?