diff --git a/hass-workstation-service/Domain/Sensors/SessionStateSensor.cs b/hass-workstation-service/Domain/Sensors/SessionStateSensor.cs
index d043a76..882cbd7 100644
--- a/hass-workstation-service/Domain/Sensors/SessionStateSensor.cs
+++ b/hass-workstation-service/Domain/Sensors/SessionStateSensor.cs
@@ -1,4 +1,6 @@
 using hass_workstation_service.Communication;
+using Serilog;
+using Serilog.Core;
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
@@ -70,7 +72,6 @@ namespace hass_workstation_service.Domain.Sensors
                 var explorerProcesses = Process.GetProcessesByName("explorer")
                                             .Select(p => p.Id.ToString())
                                             .ToHashSet();
-
                 var REprocessid = new Regex(@"(?<=Handle="").*?(?="")", RegexOptions.Compiled);
 
                 var numberOfLogonSessionsWithExplorer = new ManagementObjectSearcher(scope, new SelectQuery("SELECT * FROM Win32_SessionProcess")).Get()
@@ -79,8 +80,18 @@ namespace hass_workstation_service.Domain.Sensors
                                                             .Select(mo => mo["Antecedent"].ToString())
                                                             .Distinct()
                                                             .Count();
+                int numberOfUserDesktops = 1;
+
+                // this can fail sometimes, that's why we set numberOfUserDesktops to 1
+                try
+                {
+                    numberOfUserDesktops = new ManagementObjectSearcher(scope, new SelectQuery("select * from win32_Perfrawdata_TermService_TerminalServicesSession")).Get().Count - 1; // don't count Service desktop
+                }
+                catch
+                {
+                    
+                }
 
-                var numberOfUserDesktops = new ManagementObjectSearcher(scope, new SelectQuery("select * from win32_Perfrawdata_TermService_TerminalServicesSession")).Get().Count - 1; // don't count Service desktop
                 var numberOflogonUIProcesses = Process.GetProcessesByName("LogonUI").Length;
 
                 if (numberOflogonUIProcesses >= numberOfUserDesktops)
@@ -93,8 +104,9 @@ namespace hass_workstation_service.Domain.Sensors
                 else
                     return PCUserStatuses.InUse;
             }
-            catch
+            catch (Exception e)
             {
+                Log.Logger.Error(e, "Exception in SessionStateSensor");
                 return PCUserStatuses.Unknown;
             }
         }
diff --git a/hass-workstation-service/UserInterface.exe b/hass-workstation-service/UserInterface.exe
deleted file mode 100644
index 28706f5..0000000
Binary files a/hass-workstation-service/UserInterface.exe and /dev/null differ
diff --git a/hass-workstation-service/hass-workstation-service.csproj b/hass-workstation-service/hass-workstation-service.csproj
index f1954d8..445657e 100644
--- a/hass-workstation-service/hass-workstation-service.csproj
+++ b/hass-workstation-service/hass-workstation-service.csproj
@@ -26,7 +26,6 @@
   <ItemGroup>
     <None Remove="hass-workstation-service.pdb" />
     <None Remove="libSkiaSharp.dll" />
-    <None Remove="UserInterface.exe" />
     <None Remove="UserInterface.pdb" />
   </ItemGroup>
 
@@ -34,9 +33,6 @@
     <Content Include="libSkiaSharp.dll">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </Content>
-    <Content Include="UserInterface.exe">
-      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
-    </Content>
   </ItemGroup>
 
   <ItemGroup>