BUG #14400: pgAdmin 4 error 'utf8' codec can't decode byte...

The following bug has been logged on the website:

Bug reference: 14400
Logged by: atilio francois
Email address: francois.atilio@gmail.com
PostgreSQL version: 9.6.0
Operating system: windows
Description:

I have a postgres 9.5 database and a new one in 9.6 ( Windows)
With pgAdmin 4 I try to move tables from 9.5 to 9.6 using export and using
backup
In all cases I get an error message 'utf8' codec can't decode byte... and a
termination code -1
I tried also with a backup done with pgAdmin 3
The restore on pgadmin4 send the same type of message
Both databases are enooded UTF-8
PgAdmin 4 v1.1
I tried in two different computers: one with Windows 8, the other Windows 10

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