Object Reference not set to an instance of an Object. Bars == Null

[swcooke]

I am getting the Object Reference not set to an instance of an Object error if I use Bars.IsFirstBarOfSession. I don't understand how this is possible since I am doing a check to see if Bars == null just before the exeption gets thrown. Also, the exception is getting thrown many hundreds of bars into the script so obviously bars was not null at some point and then turned null? Take a look at this screenshot:

https://www.screencast.com/t/sLINz4TFgmy

[NinjaTrader_ChrisL]

Hello swcooke, thanks for your post.

There must be some aspect of your script that's causing this. When I run a contrived test IsFirstBarOfSession works for me. If you strip out code that is not needed to detect IsFirstBarOfSession does it return true or false in this instance?

[fx.practic]

Hi, swcooke.

Try to check the State value when error happened.

Probably, exception happened in another part of program and script start disposing, and that moment you may receive "null reference" error in any line, referring NT objects .

[swcooke]

Where would State be listed? I don't see it here with the rest of the variables:

https://www.screencast.com/t/kpEZfieWPzj

[NinjaTrader_ChrisL]

Hi swcooke, thanks for your reply.

You can add this check to you your code to make sure the Bars object is not accessed before State.DataLoaded. If it's accessed at any time before that it can cause errors.

[swcooke]

Chris,

This is not happening until a few hundred bars in sometimes.I am way passed the State.Dataloaded State. I was trying to locate the State value in VS after the exception occurs. See post from user: fx.practic.

[NinjaTrader_ChrisL]

Hi swcooke, thanks for your patience.

I am getting a State enum variable in "this" from the VS Autos:

https://clauber.tinytake.com/tt/NDE2NjUzMF8xMjg5ODU3Mw

Is there any further inheritance being used in your script exceeding NinjaScript.Indicators.Indicator?

[fx.practic]

I meant just this:

https://ninjatrader.com/support/helpGuides/nt8/state.htm

Just try to put State variable in watch window.

I guess, it would be State.Finalized