cefsharp/CefSharp · info · InvalidOperationException

Nested Exception Invalid

Error message

Nested Exception Invalid

What it means

Thrown as the inner exception in ExceptionTestBoundObject.TriggerNestedExceptions() — example code that deliberately creates a DivisionByZero, wraps it in an InvalidOperationException, which is then wrapped again in an OperationCanceledException. It tests how CefSharp serializes nested exception chains across the C#/JS boundary. Not a production error.

Source

Thrown at CefSharp.Example/JavascriptBinding/ExceptionTestBoundObject.cs:30

    {
        [DebuggerStepThrough]
        private double DivisionByZero(int zero)
        {
            return 10 / zero;
        }

        [DebuggerStepThrough]
        public double TriggerNestedExceptions()
        {
            try
            {
                try
                {
                    return DivisionByZero(0);
                }
                catch (Exception innerException)
                {
                    throw new InvalidOperationException("Nested Exception Invalid", innerException);
                }
            }
            catch (Exception e)
            {
                throw new OperationCanceledException("Nested Exception Canceled", e);
            }
        }

        [DebuggerStepThrough]
        public int TriggerParameterException(int parameter)
        {
            return parameter;
        }

        public void TestCallbackException(IJavascriptCallback errorCallback, IJavascriptCallback errorCallbackResult)
        {
            const int taskDelay = 500;

View on GitHub (pinned to 16bc6e0711)

Solutions

1. Expected test/demo behavior — not a real defect.
2. Remove ExceptionTestBoundObject if you copied example code into your project.
3. In your own bound objects, avoid wrapping exceptions unnecessarily; let the original propagate.

Example fix

// JavaScript
try { await boundObj.triggerNestedExceptions(); }
catch (e) {
  console.log(e); // contains inner chain for inspection
}

// In JavaScript
try { await boundObj.triggerNestedExceptions(); }
catch (e) { console.log('Inner chain:', e); }

When it happens

Trigger: Calling the bound TriggerNestedExceptions() method from JavaScript in the example browser. The inner division by zero is the original cause.

Common situations: Running the CefSharp.Example exception tests. Not present in production apps.

Related errors

• Nested Exception Canceled
• This is an exception coming from C#
• Expected Exception
• An IFrame instance is required.
• Unable to find parent TabPage

AI-assisted analysis of cefsharp/CefSharp@16bc6e0711 (2026-08-13). Data as JSON: /api/errors/ce86271603e4a322. Report an issue: GitHub.