pgadmin 3.5 drop database fails because of active connection

Version

3.5

Copyright

Copyright 2013 - 2018, The pgAdmin Development Team

Python Version

3.6.5 (v3.6.5:f59c0932b4, Mar 28 2018, 16:07:46) [MSC v.1900 32 bit (Intel)]

Flask Version

0.12.4

Application Mode

Desktop

Current User

pgadmin4@pgadmin.org

-          windows 10

-          desktop

I try and click on a db in tree view and from menu select delete/drop

-          get msg:

Error message

ERROR: database "mah" is being accessed by other users DETAIL: There is 1 other session using the database.

-          Appears selecting the db from tree view creates session, therefore always a session to db and unable to drop from gui