Hi Patrik ,
Greetings from Syncfusion.
We have analyzed your query with attached video. While validating the provided code snippet we found that you haven’t initialize the query, so that issue was occurred. Once you initialize the query, the chart will render properly. We have created sample based on your requirement by initializing the empty query, the chart is working fine.
<e-accumulation-series xName="CustomerID" yName="OrderID" innerRadius="40%" name="Kategorie" explode=true explodeOffset="10%" explodeIndex=3 query="new ej.data.Query()">
<e-data-manager crossDomain="true" url="@Url.Action("UrlDatasource")" adaptor="UrlAdaptor"></e-data-manager>