[BUG] Application keeps crashing

[wfvdijk]

Environment

• SQL Server 2019 / 2022
• Windows 11 Pro
• Lite
• 1.1.0.0

Describe the Bug

Application crashes after some time, but mostly within 5 minutes. The front-end stops/disappears, but a backend process keeps running. I cannot restart the front-end due to the running backend proces

Steps to Reproduce

1. run the app (with admin rights)
2. wait

Expected Behavior

No crashes

Actual Behavior

It crashes after some time

Error Messages

No error messages

Screenshots

Not Applicable

Additional Context

I have 3 SQL Server monitoring, all on-premise

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[erikdarlingdata]

Hi — a few things here.

First, please check whether the app is minimized to the system tray. Lite minimizes to the tray by default, so what looks like a crash may just be the window being hidden. Look for the icon in the system tray (or the overflow area) and try double-clicking it or right-clicking → Show Window.

Second, the bug report template asks for a few things that would help us actually diagnose this, and the README has a Troubleshooting section that covers common issues and where to find logs:

1. Logs — Application logs are written to the logs/ folder next to the executable. If the app genuinely crashed, there will be entries there. Please attach or paste the relevant log contents.
2. Version — You listed "1.1.0.0" but didn't specify whether this is the Lite edition or the Full (Dashboard) edition. The environment section says "Lite" but the description references a "backend process," which doesn't exist in Lite — it's a single self-contained EXE. Can you clarify what you're seeing in Task Manager?
3. Reproduction — "Run the app and wait" isn't much to go on. Is it happening during active use, or while idle? Does it happen with all 3 servers connected, or with just one?

Without logs, we're guessing. Please check the tray first, and if it is a real crash, grab the logs and we can take it from there.

[jaglick]

Hi @erikdarlingdata ,

I also find that after an indeterminate/varying amount of time, the full Performance Monitor Dashboard v1.2.0 crashes. I have two servers connected. I see the following error in the Windows Event log:

Log Name:      Application
Source:        .NET Runtime
Date:          2/19/2026 12:17:47 PM
Event ID:      1026
Task Category: None
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      {removed}
Description:
Application: PerformanceMonitorDashboard.exe
CoreCLR Version: 8.0.2426.7010
.NET Version: 8.0.24
Description: The process was terminated due to an unhandled exception.
Exception Info: System.ApplicationException: Object synchronization method was called from an unsynchronized block of code.
   at System.Threading.Mutex.ReleaseMutex()
   at PerformanceMonitorDashboard.App.OnExit(ExitEventArgs e) in D:\a\PerformanceMonitor\PerformanceMonitor\Dashboard\App.xaml.cs:line 62
   at System.Windows.Application.DoShutdown()
   at System.Windows.Application.ShutdownImpl()
   at System.Windows.Application.ShutdownCallback(Object arg)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
   at System.Windows.Threading.DispatcherOperation.InvokeImpl()
   at MS.Internal.CulturePreservingExecutionContext.CallbackWrapper(Object obj)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location ---
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
   at MS.Internal.CulturePreservingExecutionContext.Run(CulturePreservingExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Windows.Threading.DispatcherOperation.Invoke()
   at System.Windows.Threading.Dispatcher.ProcessQueue()
   at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
   at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
   at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
   at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
   at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
   at System.Windows.Application.RunDispatcher(Object ignore)
   at System.Windows.Application.RunInternal(Window window)
   at PerformanceMonitorDashboard.App.Main()

Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name=".NET Runtime" />
    <EventID Qualifiers="0">1026</EventID>
    <Version>0</Version>
    <Level>2</Level>
    <Task>0</Task>
    <Opcode>0</Opcode>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2026-02-19T17:17:47.7430712Z" />
    <EventRecordID>189897</EventRecordID>
    <Correlation />
    <Execution ProcessID="49948" ThreadID="0" />
    <Channel>Application</Channel>
    <Computer>{removed}</Computer>
    <Security />
  </System>
  <EventData>
    <Data>Application: PerformanceMonitorDashboard.exe
CoreCLR Version: 8.0.2426.7010
.NET Version: 8.0.24
Description: The process was terminated due to an unhandled exception.
Exception Info: System.ApplicationException: Object synchronization method was called from an unsynchronized block of code.
   at System.Threading.Mutex.ReleaseMutex()
   at PerformanceMonitorDashboard.App.OnExit(ExitEventArgs e) in D:\a\PerformanceMonitor\PerformanceMonitor\Dashboard\App.xaml.cs:line 62
   at System.Windows.Application.DoShutdown()
   at System.Windows.Application.ShutdownImpl()
   at System.Windows.Application.ShutdownCallback(Object arg)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
   at System.Windows.Threading.DispatcherOperation.InvokeImpl()
   at MS.Internal.CulturePreservingExecutionContext.CallbackWrapper(Object obj)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location ---
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
   at MS.Internal.CulturePreservingExecutionContext.Run(CulturePreservingExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Windows.Threading.DispatcherOperation.Invoke()
   at System.Windows.Threading.Dispatcher.ProcessQueue()
   at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean&amp; handled)
   at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean&amp; handled)
   at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
   at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
   at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
   at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG&amp; msg)
   at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
   at System.Windows.Application.RunDispatcher(Object ignore)
   at System.Windows.Application.RunInternal(Window window)
   at PerformanceMonitorDashboard.App.Main()
</Data>
  </EventData>
</Event>

[erikdarlingdata]

Fixed by PR #158 (mutex crash on app exit).