How to avoid Binding Error when parent is removed
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I am working on a WPF project, and I am creating some styles, one of them is the DataGridCell style, it works fine. 

My problem is that: **When the user delete any row, many errors are shown in the Visual Studio's Output window.**

This is the error:

    System.Windows.Data Warning: 4 : Cannot find source for binding with reference 'RelativeSource FindAncestor, AncestorType='System.Windows.Controls.DataGrid', AncestorLevel='1''.
    BindingExpression:Path=CanUserAddRows; DataItem=null; target element is 'DataGridCell' (Name=''); target property is 'NoTarget' (type 'Object')

So, I guess the error is because when the DataGridCell is removed from the DataGrid, the binding does not find the the Parent, but, **What can I do to avoid getting these errors?? I mean, how can I establish a condition for the binding??**

My XAML Style code is as following:

    <DataGrid Margin="6,25,6,35" x:Name="dataGrid">            
            <DataGrid.CellStyle>
                <Style TargetType="{x:Type DataGridCell}">
                    <Style.Triggers>
                        <MultiDataTrigger>
                            <MultiDataTrigger.Conditions>
                                <Condition Binding="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGrid}}, Path=CanUserAddRows}" Value="False" />
                                <Condition Binding="{Binding RelativeSource={RelativeSource Self}, Path=IsSelected}" Value="True" />
                            </MultiDataTrigger.Conditions>
                            <Setter Property="Background" Value="#A4A4A4"/>
                        </MultiDataTrigger>
    . . . . . 

Hope someone can help me,  thanks in advance.