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**greenhollow803** · 11-17-2023, 09:58 AM

11/17/2023 10:50:23 AM

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AddOn 'NinjaAddonsToolBar': Error on calling 'OnWindowDestroyed' method: System.NullReferenceException: Object reference not set to an instance of an object.

**NinjaTrader_ChelseaB** · 11-17-2023, 10:01 AM

Hello greenhollow803,

The write lock error typically occurs when accessing a different thread.

For example using Dispatcher.Invoke() or BeginInvoke() instead of using Dispatcher.InvokeAsync() can cause this type of error.

The null object error means there is a variable with a null value that was attempted to be used.

entryOrder = null; ERROR - NinjaTrader Support Forum

https://ninjatrader.com/support/forum/forum/ninjatrader-8/strategy-development/1107472-entryorder-null-error#post1107522

Hello, I keep running into an error of "Object reference not set to an instance of an object." when I set the entryOrder to Null after it has been cancelled. Below is the block of code that I found in several of the example strategies. protected override void OnOrderUpdate(Order order, double limitPrice,

What is the specific line of code causing the error?

**greenhollow803** · 11-17-2023, 10:05 AM

Thanks for your qiuick response Chelsea.

I am not able to get the line of code which is throwing error. The chart window hangs and I am forced to close the NT8 and restart. Any leads to identify the line of code causing the issue

**NinjaTrader_ChelseaB** · 11-17-2023, 10:12 AM

Hello greenhollow803,

You can temporarily use a try and catch to figure out which line is causing the error.

C# Exceptions (Try..Catch)

https://www.w3schools.com/cs/cs_exceptions.php

W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more.

You can also comment out logic until the error stops, then uncomment lines until the error returns to identify the last line that was uncommented as the line causing the error.

**greenhollow803** · 11-17-2023, 10:13 AM

I already have try catch at most of the places. Let me try to added for each method and get back to you if it freezes again

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