Thank you for contacting Syncfusion support.
We have checked your reported issue and found that you have mentioned the ListBox with hyphen (list-box) which caused this issue. So, we would suggest you use “listbox” text as like in the below code example to avoid this issue.
'noRecordsTemplate': "Keine Ergebnisse",
For your convenience, we have prepared the sample based on our suggestion. Please find the link below.
Could you please check the above sample and get back to us, if you need any further assistance on this?
Vinoth Kumar S