Opening config produces Errno 22

Problem

Trying to open the config file on Windows 10 with beet -vv config -e leads to error: Could not edit configuration: [Errno 22] Invalid argument. Checked the file and it exists and would be open with Notepad++.

Setup

• OS: Windows 10
• Python version: Python 3.6 (Python 2.7 is installed to put not used by default)
• beets version: 1.4.6
• Turning off plugins made problem go away (yes/no): don't have any

My configuration (output of beet config) is:

{}