Appliance for Raspberry Pi 4: pressing "VMs" leads to Web interface error

Hi there,

pressing the “VMs” tab leads to a Web interface error:

parsererror

SyntaxError: JSON.parse: unexpected end of data at line 1 column 1 of the JSON data

ajaxConvert@http://192.xxxxxx/js/jquery-3.chash-11c05eb286ed576526bf4543760785b9.4.1.js:9013:19
done@http://192.xxxxxx/js/jquery-3.chash-11c05eb286ed576526bf4543760785b9.4.1.js:9483:15
callback/<@http://192.xxxxxx/js/jquery-3.chash-11c05eb286ed576526bf4543760785b9.4.1.js:9785:17

Please note that I did not work with VMs on this appliance.