BUG #16360: [pgadmin-v4.20] error string indices must be integers

The following bug has been logged on the website:

Bug reference:      16360
Logged by:          DarDev
Email address:      darius.e.pastas@gmail.com
PostgreSQL version: 12.2
Operating system:   MAC
Description:        

When you navigating in the folders tree to -> server->database'>schema->
table it automatically pops up : `string indices must be integers` with
title Error retrieving data from the server: INTERNAL SERVER ERROR