Javascript errors are thrown when pie chart with custom skin is loaded. The issue is introduced as of version 2017.1.118.

Code to reproduce:
        <telerik:RadHtmlChart ID="Telerik1" runat="server" Height="250px" Width="250px" EnableEmbeddedSkins="false" Skin="CMS_Black">
            <ChartTitle Text="Financial Aid Status1112">
                <Appearance>
                    <TextStyle Color="Red" FontSize="12" FontFamily="Verdana" Margin="11" Padding="22"></TextStyle>
                </Appearance>
            </ChartTitle>
            <PlotArea>
                <Series>
                    <telerik:PieSeries Name="TypeMemberCount1" NameField="Name" DataFieldY="Value">
                        <LabelsAppearance>
                            <ClientTemplate>
                               #=dataItem.Name#: #=dataItem._Value# (#=dataItem._Percentage#%)
                            </ClientTemplate>
                        </LabelsAppearance>
                    </telerik:PieSeries>
                </Series>
            </PlotArea>
            <Legend>
                <Appearance Position="Right" Visible="true">
                </Appearance>
            </Legend>
        </telerik:RadHtmlChart>


Code bihind:

    protected void Page_Load(object sender, EventArgs e)
    {
        Telerik1.DataSource = GetData();
        Telerik1.DataBind();

    }
    private DataTable GetData()
    {
        DataTable dt = new DataTable("ChargeData");
        
        dt.Columns.Add("Id", Type.GetType("System.Int32"));

        dt.Columns.Add("Name", Type.GetType("System.String"));
        dt.Columns.Add("Value", Type.GetType("System.Int32"));
        dt.Columns.Add("_Value", Type.GetType("System.Int32"));
        dt.Columns.Add("_Percentage", Type.GetType("System.Int32"));

        dt.Rows.Add(1, "Item 1", 10, 34, 10);
        dt.Rows.Add(2, "Item 2", 65, 34, 65);
        dt.Rows.Add(3, "Item 3", 25, 34, 25);
        return dt;
    }


web.config:

    <add key="Telerik.Skin" value="CMS_Black"/>

Ticket 1113172