diff --git a/Borepin/Borepin/Model/UserVisualize.cs b/Borepin/Borepin/Model/UserVisualize.cs
index 8f3d3b5..250c62a 100644
--- a/Borepin/Borepin/Model/UserVisualize.cs
+++ b/Borepin/Borepin/Model/UserVisualize.cs
@@ -20,6 +20,11 @@ namespace Borepin.Model
         #region LoadData
         public Task LoadData()
         {
+            if(_User == null) 
+            {
+                return Task.CompletedTask;
+            }
+
             //ID = _User.Id;
             Username = _User.Username;
             //Space = new SpaceVisualize(_User.Space);
diff --git a/Borepin/Borepin/Page/AddServerProcess/SelectServerPage.xaml b/Borepin/Borepin/Page/AddServerProcess/SelectServerPage.xaml
index b91dfbc..b8b2a51 100644
--- a/Borepin/Borepin/Page/AddServerProcess/SelectServerPage.xaml
+++ b/Borepin/Borepin/Page/AddServerProcess/SelectServerPage.xaml
@@ -22,9 +22,11 @@
                 <Button Text="{x:Static resource_text:TextResource.AddServerProcess_SelectServerPage_Connect}" Command="{Binding ConnectToServerCommand}" Style="{StaticResource Style_Button_Primary}"/>
                 <Button Text="{x:Static resource_text:TextResource.SCANQR}" Command="{Binding ScanCodeCommand}" Style="{StaticResource Style_Button_Primary}">
                     <Button.IsVisible>
-                        <OnPlatform x:TypeArguments="x:Boolean"
-                        iOS="true"
-                        Android="true"/>
+                        <OnPlatform x:TypeArguments="x:Boolean">
+                            <On Platform="iOS" Value="True" />
+                            <On Platform="Android" Value="True" />
+                            <On Platform="UWP" Value="False" />
+                        </OnPlatform>
                     </Button.IsVisible>
                 </Button>
                 <Label Text="{x:Static resource_text:TextResource.AddServerProcess_SelectServerPage_Info}" Margin="0, 20, 0, 0"></Label>
diff --git a/Borepin/Borepin/Page/CreateCardPage.xaml b/Borepin/Borepin/Page/CreateCardPage.xaml
index 5bf96a5..072c61e 100644
--- a/Borepin/Borepin/Page/CreateCardPage.xaml
+++ b/Borepin/Borepin/Page/CreateCardPage.xaml
@@ -37,7 +37,7 @@
                         <ColumnDefinition Width="1*" />
                     </Grid.ColumnDefinitions>
                     <Entry Grid.Column="0" Text="{Binding PICCKey}" IsSpellCheckEnabled="false"/>
-                    <Button Grid.Column="2" Text="Scan QR-Code" Command="{Binding ScanPICCKeyCommand}" Style="{StaticResource Style_Button_Primary}"/>
+                    <Button Grid.Column="2" Text="Scan QR-Code" Command="{Binding ScanPICCKeyCommand}" Style="{StaticResource Style_Button_Primary}" IsVisible="False"/>
                 </Grid>
                 
                 <Label Text="Application Key" Style="{StaticResource Style_Label_Property_Title}"></Label>
@@ -49,7 +49,7 @@
                     </Grid.ColumnDefinitions>
                     <Entry Grid.Column="0" Text="{Binding APPKey}" IsSpellCheckEnabled="false"/>
                     <Button Grid.Column="1" Text="Random" Command="{Binding RandomAPPKeyCommand}" Style="{StaticResource Style_Button_Primary}"/>
-                    <Button Grid.Column="2" Text="Scan QR-Code" Command="{Binding ScanAPPKeyCommand}" Style="{StaticResource Style_Button_Primary}"/>
+                    <Button Grid.Column="2" Text="Scan QR-Code" Command="{Binding ScanAPPKeyCommand}" Style="{StaticResource Style_Button_Primary}" IsVisible="False"/>
                 </Grid>
 
                 <StackLayout Orientation="Horizontal">
diff --git a/Borepin/Borepin/Page/MachineListPage.xaml b/Borepin/Borepin/Page/MachineListPage.xaml
index 2201d09..1f7a802 100644
--- a/Borepin/Borepin/Page/MachineListPage.xaml
+++ b/Borepin/Borepin/Page/MachineListPage.xaml
@@ -29,12 +29,14 @@
                     </MultiBinding>
                 </StackLayout.IsVisible>
                 <Button Text="{x:Static resource_text:TextResource.SCANQR}" Command="{Binding ScanCodeCommand}" Style="{StaticResource Style_Button_Primary}">
-                        <Button.IsVisible>
-                            <OnPlatform x:TypeArguments="x:Boolean"
-                            iOS="True"
-                            Android="True"/>
-                        </Button.IsVisible>
-                    </Button>
+                    <Button.IsVisible>
+                        <OnPlatform x:TypeArguments="x:Boolean">
+                            <On Platform="iOS" Value="True" />
+                            <On Platform="Android" Value="True" />
+                            <On Platform="UWP" Value="False" />
+                        </OnPlatform>
+                    </Button.IsVisible>
+                </Button>
                 <ListView ItemsSource="{Binding MachineListItemViewModel_List}" SelectionMode="None" SeparatorColor="Transparent" IsGroupingEnabled="True" GroupDisplayBinding="{Binding Category}">
                     <ListView.GroupHeaderTemplate>
                         <DataTemplate>
diff --git a/Borepin/Borepin/Page/MachinePage.xaml b/Borepin/Borepin/Page/MachinePage.xaml
index e82055f..47857ae 100644
--- a/Borepin/Borepin/Page/MachinePage.xaml
+++ b/Borepin/Borepin/Page/MachinePage.xaml
@@ -43,29 +43,18 @@
                         <Label Text="{Binding MachineItem.CurrentUser.Username}" Style="{StaticResource Style_Label_Property_Text}"/>
                     </StackLayout>
 
-                    <Button Text="{x:Static resource_text:TextResource.MachinePage_Use}" IsVisible="{Binding MachineItem.CanUse}" Command="{Binding UseMachineCommand}" Style="{StaticResource Style_Button_Primary}"/>
-                    <Label Text="{x:Static resource_text:TextResource.MachinePage_CanNotUseByPermission}" IsVisible="{Binding MachineItem.CanNotUseByPermission}" Style="{StaticResource Style_Label_Text_Center}" TextColor="{StaticResource FourthColor}"/>
-                    <Button Text="{x:Static resource_text:TextResource.MachinePage_GiveBack}" IsVisible="{Binding MachineItem.CanInUse}" Command="{Binding GiveBackMachineCommand}" Style="{StaticResource Style_Button_Primary}"/>
+                    <StackLayout>
+                        <Button Text="{x:Static resource_text:TextResource.MachinePage_Use}" IsVisible="{Binding MachineItem.CanUse}" Command="{Binding UseMachineCommand}" Style="{StaticResource Style_Button_Primary}"/>
+                        <Label Text="{x:Static resource_text:TextResource.MachinePage_CanNotUseByPermission}" IsVisible="{Binding MachineItem.CanNotUseByPermission}" Style="{StaticResource Style_Label_Text_Center}" TextColor="{StaticResource FourthColor}"/>
+                        <Button Text="{x:Static resource_text:TextResource.MachinePage_GiveBack}" IsVisible="{Binding MachineItem.CanInUse}" Command="{Binding GiveBackMachineCommand}" Style="{StaticResource Style_Button_Primary}"/>
+                    </StackLayout>
 
-                    <Button Text="{x:Static resource_text:TextResource.MachinePage_Unlock}" Command="{Binding UnlockLockCommand}" Style="{StaticResource Style_Button_Primary}">
-                        <Button.IsVisible>
-                            <MultiBinding Converter="{StaticResource AllTrueBoolConverter}">
-                                <Binding Path="MachineItem.CanInUse" Converter="{StaticResource InvertBoolConverter}"/>
-                                <Binding Path="MachineItem.IsLock" />
-                            </MultiBinding>
-                        </Button.IsVisible>
-                    </Button>
-                    <Button Text="{x:Static resource_text:TextResource.MachinePage_Identify}" Command="{Binding IdentifyLockCommand}" Style="{StaticResource Style_Button_Primary}">
-                        <Button.IsVisible>
-                            <MultiBinding Converter="{StaticResource AllTrueBoolConverter}">
-                                <Binding Path="MachineItem.CanInUse" Converter="{StaticResource InvertBoolConverter}"/>
-                                <Binding Path="MachineItem.IsLock" />
-                            </MultiBinding>
-                        </Button.IsVisible>
-                    </Button>
+                    <StackLayout Margin="0,10,0,0" IsVisible="{Binding MachineItem.IsLock}">
+                        <Button Text="{x:Static resource_text:TextResource.MachinePage_Unlock}" Command="{Binding UnlockLockCommand}" Style="{StaticResource Style_Button_Primary}"/>
+                        <Button Text="{x:Static resource_text:TextResource.MachinePage_Identify}" Command="{Binding IdentifyLockCommand}" Style="{StaticResource Style_Button_Primary}"/>
+                    </StackLayout>
 
-
-                    <Button VerticalOptions="End" Text="{x:Static resource_text:TextResource.MachinePage_OpenWiki}" IsVisible="{Binding MachineItem.Wiki, Converter={StaticResource IsNotNullBoolConverter}}" Command="{Binding OpenWikiCommand}" Style="{StaticResource Style_Button_Primary}"/>
+                    <Button VerticalOptions="End" Text="{x:Static resource_text:TextResource.MachinePage_OpenWiki}" IsVisible="{Binding MachineItem.Wiki, Converter={StaticResource IsNotNullBoolConverter}}" Command="{Binding OpenWikiCommand}" Margin="0,10,0,0" Style="{StaticResource Style_Button_Primary}"/>
                     <StackLayout Grid.Row="2" VerticalOptions="End" IsVisible="{Binding MachineItem.CanManage}" Margin="0,50,0,0">
                         <Label Text="{x:Static resource_text:TextResource.MachinePage_ManageMachine}" Style="{StaticResource Style_Label_Property_Title}"/>
                         <StackLayout Orientation="Horizontal" IsVisible="{Binding MachineItem.LastUser, Converter={StaticResource IsNotNullBoolConverter}}">
diff --git a/Borepin/Borepin/Page/UserPage.xaml b/Borepin/Borepin/Page/UserPage.xaml
index e314dc8..d991521 100644
--- a/Borepin/Borepin/Page/UserPage.xaml
+++ b/Borepin/Borepin/Page/UserPage.xaml
@@ -41,9 +41,19 @@
                     <Button Text="{x:Static resource_text:TextResource.UserPage_UpdatePassword}" Command="{Binding UpdatePasswordCommand}" Style="{StaticResource Style_Button_Primary}"/>
                 </StackLayout>
                 <StackLayout IsVisible="{Binding CanCreateCard}">
-                    <Button Text="{x:Static resource_text:TextResource.UserPage_CreateCard}" Command="{Binding CreateCardCommand}" IsVisible="{Binding HasCardBinded, Converter={StaticResource InvertBoolConverter}}" Style="{StaticResource Style_Button_Primary}"/>
-                    <Button Text="{x:Static resource_text:TextResource.UserPage_UnbindCard}" Command="{Binding UnbindCardCommand}" IsVisible="{Binding HasCardBinded}" Style="{StaticResource Style_Button_Admin}"/>
+                    <StackLayout >
+                        <StackLayout.IsVisible>
+                            <OnPlatform x:TypeArguments="x:Boolean">
+                                <On Platform="iOS" Value="False" />
+                                <On Platform="Android" Value="False" />
+                                <On Platform="UWP" Value="True" />
+                            </OnPlatform>
+                        </StackLayout.IsVisible>
+                        <Button Text="{x:Static resource_text:TextResource.UserPage_CreateCard}" Command="{Binding CreateCardCommand}" IsVisible="{Binding HasCardBinded, Converter={StaticResource InvertBoolConverter}}" Style="{StaticResource Style_Button_Primary}"/>
+                        <Button Text="{x:Static resource_text:TextResource.UserPage_UnbindCard}" Command="{Binding UnbindCardCommand}" IsVisible="{Binding HasCardBinded}" Style="{StaticResource Style_Button_Admin}"/>
+                    </StackLayout>
                 </StackLayout>
+                
                 <Button Text="{x:Static resource_text:TextResource.DELETE}" Command="{Binding DeleteCommand}" Style="{StaticResource Style_Button_Admin}"/>
             </StackLayout>
         </StackLayout>
diff --git a/Borepin/Borepin/PageModel/UserPageModel.cs b/Borepin/Borepin/PageModel/UserPageModel.cs
index 5c1bea9..0a799e7 100644
--- a/Borepin/Borepin/PageModel/UserPageModel.cs
+++ b/Borepin/Borepin/PageModel/UserPageModel.cs
@@ -71,6 +71,11 @@ namespace Borepin.PageModel
             }
 
             _User = (await _API.Session.UserSystem.Search.GetUserByName(_ID).ConfigureAwait(false)).Just;
+            if(_User == null ) 
+            {
+                return;
+            }
+
             UserItem = new UserVisualize(_User);
             await UserItem.LoadData().ConfigureAwait(false);