BUG #15813: PGAdmin 4: The application server could not be contacted

The following bug has been logged on the website:

Bug reference: 15813
Logged by: Christian Schürhoff
Email address: qwert268862(at)gmail(dot)com
PostgreSQL version: 10.8
Operating system: Windows 10 Pro 64-Bit 1809
Description:

Traceback (most recent call last):
File "C:/Program Files (x86)/PostgreSQL/10/pgAdmin 4/web/pgAdmin4.py",
line 186, in <module>
threaded=config.THREADED_MODE
File "C:/Program Files (x86)/PostgreSQL/10/pgAdmin
4/venv/Lib/site-packages\flask\app.py", line 943, in run
run_simple(host, port, self, **options)
File "C:/Program Files (x86)/PostgreSQL/10/pgAdmin
4/venv/Lib/site-packages\werkzeug\serving.py", line 990, in run_simple
inner()
File "C:/Program Files (x86)/PostgreSQL/10/pgAdmin
4/venv/Lib/site-packages\werkzeug\serving.py", line 943, in inner
fd=fd,
File "C:/Program Files (x86)/PostgreSQL/10/pgAdmin
4/venv/Lib/site-packages\werkzeug\serving.py", line 786, in make_server
host, port, app, request_handler, passthrough_errors, ssl_context,
fd=fd
File "C:/Program Files (x86)/PostgreSQL/10/pgAdmin
4/venv/Lib/site-packages\werkzeug\serving.py", line 679, in __init__
HTTPServer.__init__(self, server_address, handler)
File "C:/Program Files (x86)/PostgreSQL/10/pgAdmin
4/venv/Lib\socketserver.py", line 453, in __init__
self.server_bind()
File "C:/Program Files (x86)/PostgreSQL/10/pgAdmin
4/venv/Lib\http\server.py", line 138, in server_bind
self.server_name = socket.getfqdn(host)
File "C:/Program Files (x86)/PostgreSQL/10/pgAdmin 4/venv/Lib\socket.py",
line 673, in getfqdn
hostname, aliases, ipaddrs = gethostbyaddr(name)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xfc in position 3:
invalid start byte