TokenizingTextbox crashing on Android

[TopperDEL]

Describe the bug

I've added a TokenizingTextbox to a page and it works as expected on UWP. On Android it accepts input but after a while (presumably while trying to convert my word into a token) it bring a long native stacktrace (see attachment), blocks the application and finaly crashes the application.

Steps to Reproduce

1. Add a TokenizingTextBox to a page like this:

<Page
    x:Class="NutzMich.Pages.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:NutzMich"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"     xmlns:xamarin="http://uno.ui/xamarin"
    xmlns:toolkit="using:Uno.UI.Toolkit" xmlns:controls="using:Microsoft.Toolkit.Uwp.UI.Controls"
    mc:Ignorable="d">

    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>

        <controls:TokenizingTextBox Grid.Row="0"></controls:TokenizingTextBox>
</Grid>
</Page>

2. Run the application on Android
3. Enter a word, hit space or enter
4. Stacktrace appears and app quits after some seconds

Expected behavior

The TokenizingTextBox works on Android like expected.

Environment

NuGet Package(s): 6.1.0-build.178.gc768b0f669

- [X] Android
Did not test iOs, MacOS or WASM.

Visual Studio 
- [ ] 2017 (version: )
- [X] 2019 (version: ) 
- [ ] 2019 Preview (version: )

ExceptionStacktrace.txt