Android Question [B4X] Custom View cause a error if the user input a wrong variable

#DesignerProperty: Key: Icon_direction, DisplayName: Icon Direction, FieldType: String, DefaultValue: LEFT, List: LEFT|MIDDLE|RIGHT

Public Sub setMyProperty(MyProperty As String)
    If MyProperty = Option1 Or MyProperty = Option2 Or MyProperty = Option3 Then
        mMyProperty = MyProperty 'class internal variable
        'other code
    Else
        MsgBox(....
    End If
End Sub

Public Sub getMyProperty As String
    Return MyProperty
End Sub