"The given key was not present in the dictionary" error message when launching NPrinting Designer 18 or 19 from Internet Explorer

The problem occurs when a user connected to the NPrinting Web Console with Internet Explorer tries to edit a report. The problem is affecting only updated Windows machines.
To replicate the problem:

To replicate the problem:
1. Install the Windows update KB4489881 (Monthly Rollup)

https://support.microsoft.com/en-us/help/4489881/windows-8-1-update-kb4489881

2. Connect to NPrinting Internet  Explorer
3. Go to Reports and open a report or create a new one
4. Click on Edit Template
5. Click "Allow" if requested,

The error message "The given key was not present in the dictionary" is shown. Only the option to click OK is given. NPrinting Designer cannot be opened. NPrinting designer was working correctly before the mentioned Windows update.

Notice that sometime the error message is not shown.

Environment:

• NPrinting 17 any releases
• NPrinting 18 any releases
• NPrinting 19 February release

• OP-8491

• Qlik NPrinting April 2019 and higher