Uncaught DOMException when trying to select an airport for a created war unit

1. Create a new air wing unit
2. Click on Select from a list button
3. Click on Select button for any available airport

Actual result in browser console log:

Uncaught DOMException: Blocked a frame with origin "https://sim02.simcountry.com" from accessing a cross-origin frame.
at forwardExplainLocation (https://jscache.simcountry.com/wgscript_jsvhl.js:55613:14)
at HTMLAnchorElement.onclick (https://sim02.simcountry.com/cgi-bin/cgi2nova?SN_ADDRESS=wwwCountry&SN_METHOD=warselbase&miKindOfTarget=51&miSubKind=51:267:142)
forwardExplainLocation @ wgscript_jsvhl.js:55613
onclick @ cgi2nova?SN_ADDRESS=wwwCountry&SN_METHOD=warselbase&miKindOfTarget=51&miSubKind=51:267


Regards