The Box Plot Chart throws the following errors when used:

RadHtmlChart.js:1 Uncaught ReferenceError: series is not defined
Uncaught (in promise) ReferenceError: series is not defined

I recently upgraded the Telerik version from 2025.1.416 to 2025.3.825, and started getting this NullReferenceException during debugging.

I noticed I get the error when debugging RadGrid with the Skin property.

The problem is that when you click the buttons, the RadDateRangePicker is filled with the start of 2025-06-01 and the end of 2025-06-30. Then, when you click the button again, a change should occur in the RadDateRangePicker: start of 2025-07-01 and end of 2025-07-31.


1 step => correct

2 step => incorrect


Result
The first time you click the button, it returns the start date to 06/01/2025 and the end date to 06/30/2025 (this is correct). Clicking it again returns the start date to 06/30/2025 and the end date to 07/31/2025 (this is incorrect).

Work around
 - Local page
js code fixed 

const datepicker = $find('<%= radDateRangePicker2.ClientID %>');

datepicker.set_rangeSelectionStartDate(null);
datepicker.set_rangeSelectionEndDate(null);

- Global fixed All controls
C# in extension control 

public bool EnableDateResetting
{
    get => ViewState["EnableDateResetting"] as bool? ?? false;
    set => ViewState["EnableDateResetting"] = value;
}

public eDateRangePicker() : base()
{
	Load += EDateRangePicker_Load;
}

private void EDateRangePicker_Load(object sender, EventArgs e)
{
    if (EnableDateResetting)
    {
        RegisterDateResettingScript();
    }
}

private void RegisterDateResettingScript()
{
	string script = $@"
		Sys.Application.add_load(function() {{
			const picker = $find('{ClientID}');

			if (picker) {{
				const origStart = picker.set_rangeSelectionStartDate;
				const origEnd = picker.set_rangeSelectionEndDate;

				picker.set_rangeSelectionStartDate = function(date) {{
					if (date !== null && !this._isResetting) {{
						const currentStart = this.get_rangeSelectionStartDate();
						const currentEnd = this.get_rangeSelectionEndDate();
                
						if (currentStart || currentEnd) {{
							this._isResetting = true;

							origStart.call(this, null);
							origEnd.call(this, null);

							this._isResetting = false;
						}}
					}}

					return origStart.call(this, date);
				}};

				picker.set_rangeSelectionEndDate = function(date) {{

					return origEnd.call(this, date);
				}};
			}}
		}});
	";

    ScriptManager.RegisterStartupScript(this, GetType(), $"DateResetting_{ClientID}", script, true);
}

ChatGPT recommended "Turn off Telerik’s “old” ARIA settings (they are overly strict and often invalid):"

i removed it and it worked. WTH?

What i supposed to do now? I added these settings in all our products

Hello,

Attached my grid code. Most columns are removed for readability

    <telerik:RadGrid ID="grdChanges" runat="server" Width="1140" 
        skin="WebBlue" style="margin-top:13px; margin-right:13px; outline: 0 !important;"
        ShowFooter="false" AllowSorting="false">      
    <ClientSettings>
            <Scrolling AllowScroll="True" ScrollHeight="487px" UseStaticHeaders="true" />
    </ClientSettings>                      
    <MasterTableView GroupLoadMode="Client" AutoGenerateColumns="False" HeaderStyle-Font-Bold="true"> 
        <HeaderStyle CssClass="InnerHeaderStyle"/>
        <ItemStyle CssClass="InnerItemStyle"/>
        <AlternatingItemStyle CssClass="InnerAlernatingItemStyle"/>
        <CommandItemStyle CssClass="CommandHeaderStyle" />

        <ColumnGroups>
           <telerik:GridColumnGroup Name="Passenger Trips" HeaderText="Passenger Trips" HeaderStyle-HorizontalAlign="Center"/>           
           <telerik:GridColumnGroup Name="Ton Trips" HeaderText="Ton Trips" HeaderStyle-HorizontalAlign="Center"/>                                                         
           <telerik:GridColumnGroup Name="Miles Per Trip" HeaderText="Miles Per Trip" HeaderStyle-HorizontalAlign="Center"/>           
           <telerik:GridColumnGroup Name="Miles Per Hour" HeaderText="Miles Per Hour" HeaderStyle-HorizontalAlign="Center"/>                          
        </ColumnGroups> 

        <Columns> 

            <telerik:GridNumericColumn DataField="MilesPerHour_Proj" HeaderText="Project"  
                                       ColumnGroupName ="Miles Per Hour"
                                       DataFormatString="{0:N1}" DecimalDigits="0"
                                       HeaderStyle-HorizontalAlign="Center" 
                                       HeaderStyle-Width="60px" ItemStyle-BackColor="White"
                                       ItemStyle-HorizontalAlign="Right" AllowRounding="true" />

            <telerik:GridNumericColumn DataField="MilesPerHour_Base" HeaderText="Base"  
                                       ColumnGroupName ="Miles Per Hour"
                                       DataFormatString="{0:N1}" DecimalDigits="0"
                                       HeaderStyle-HorizontalAlign="Center" 
                                       HeaderStyle-Width="60px" ItemStyle-BackColor="White"
                                       ItemStyle-HorizontalAlign="Right" AllowRounding="true" />                            

            <telerik:GridNumericColumn DataField="MilesPerHourChange" HeaderText="Change"  
                                       ColumnGroupName ="Miles Per Hour"
                                       DataFormatString="{0:N1}" DecimalDigits="0"
                                       HeaderStyle-HorizontalAlign="Center" 
                                       HeaderStyle-Width="60px" ItemStyle-BackColor="White"
                                       ItemStyle-HorizontalAlign="Right" AllowRounding="true" />
        </Columns> 

        <NoRecordsTemplate> 
            <div style="padding: 5px"> 
                No records available. 
            </div> 
        </NoRecordsTemplate> 

    </MasterTableView> 
    <FilterMenu EnableTheming="True"> 
        <CollapseAnimation Duration="200" Type="OutQuint" /> 
    </FilterMenu> 
</telerik:RadGrid>