pgAdmin4 1.0-beta3 - Cannot set "Primary key / Not NULL" on column in "The Table Dialog"

Hi,

I cannot set "Primary key / Not NULL" in "The Table Dialog". I see
"Error saving properties: INTERNAL SERVER ERROR - 'cltype'"

How to reproduce?

1. Create table
CREATE TABLE test (
id serial,
txt text not null
)
2. In sidebar, right click on "test" table and select "Properties"
3. Select "Columns"
4. Set "Primary key" to "Yes" on "id" column
5. Press "Save" button
6. "Error saving properties: INTERNAL SERVER ERROR - 'cltype'"
7. Go to point 4 and try with "Not NULL" field - the same error message

Tested on: Pgadmin4 1.0-beta3, Windows 7 x64, Server: PostgreSQL 9.5.3
on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623 (Red Hat
4.8.5-4), 64-bit

Regards,
Krzysztof Otręba