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System.NullReferenceException when using 'del' on UWP keyboard

Hello,

I'm using Syncfusion SfMaskedEdit (Version 19.4.0.42) and found an error when tapping 'del' on UWP keyboard. The following code can be used to reproduce the error: 

<ContentPage.Content>
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="auto"/>
        </Grid.RowDefinitions>
        <syncfusion_maskedit:SfMaskedEdit
            MaskType="RegEx"
            Mask="\d{2},\d{3}s"
            Value="12345">
        </syncfusion_maskedit:SfMaskedEdit>
    </Grid>
</ContentPage.Content>

Now you can see the SfMaskedEdit element on your page as "12.345s". The System.NullReferenceException occurs when you are clicking 'del' on keyboard between the numbers "4" and "5" and between the number "5" and the character "s". On all other positions clicking 'del' works without an error.

I tested this code in Android as well and the error didn't occur there. I have not carried out a test for iOS and do not know whether the error also occurs there.

Can you please check and fix this behaviour?

Thanks,

Andreas