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**bltdavid** · 02-27-2025, 08:27 AM

Which version are you running?

How often does this happen?

Are you doing anything in particular when this happens?

Are there any specific actions that seem to reproduce the problem?

**NinjaTrader_ChelseaB** · 02-27-2025, 09:13 AM

Hello carnitron,

Does the error occur when using any specific custom or 3rd party NinjaScript?

As a test, see if the error can be reproduced in a clean environment with no custom scripts.

To create a clean temporary NinjaTrader folder:

Shutdown NinjaTrader
Rename (My) Documents\NinjaTrader 8\ to (My) Documents\NinjaTrader 8.original\
Download the NinjaTrader installation package from the link below
1. NinjaTrader - Download
Run the repair from this (if the repair is unsuccessful, uninstall and then re-install NinjaTrader)

This will recreate the NinjaTrader 8 folder in (My) Documents.

Let me know if the error can be reproduced.

**carnitron** · 02-27-2025, 10:07 AM

So I can appreciate your desire for more information and reproduceable steps.

I'm saying this is a rare one-off that I just saw randomly once. I wasn't doing anything out of the ordinary, I was just test running my algo as I always do.

This is against 8.1.4.1, with no AddOns other than my own, which is nowhere present in the callstack.

I'll see if it happens again in my daily operations, and if it does, I will update this post. But if it does not, then the only way forward is for a programmer to look at the call stack. That is not guaranteed to produce insights and a fix, but this is all the info we have, and it's clearly very rare, so maybe that's ok.

Back when I worked in AAA video games, there were many instances of this kind of bug over the years, that came in from our crash logging service. You just had to look at the callstack and attempt to work out in your head what might be happening. Many times there wasn't enough info, but occasionally it was clear what the issue was, after some puzzling.

**bltdavid** · 02-27-2025, 10:20 AM

Did this exception occur recently?

If so, I'm sure NT would love your trace/log files ...

CC > Help > Email Support

**carnitron** · 02-27-2025, 12:04 PM

Yes, it occurred yesterday evening. I have sent in logs and traces as you suggested. Good idea. Cheers.

**carnitron** · 03-14-2025, 10:19 PM

I've seen this again. I'm going to have to keep an eye out as to why. This function seems highly relevant and is the culprit somehow:

NinjaTrader.Gui.Chart.Direct2D Form.RecalculateYAxisLabels().

Inside it, it is iterating an enumeration that I THINK might have been updated by another thread or modified reentrantly somehow during the enumeration:

Code:

    public static TSource FirstOrDefault<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate)
    {
        if (source == null)
        {
            throw Error.ArgumentNull("source");
        }
        if (predicate == null)
        {
            throw Error.ArgumentNull("predicate");
        }
        foreach (TSource item in source)    // <-- happens right here.
        {
            if (predicate(item))
            {
                return item;
            }
        }
        return default(TSource);
    }

Interestingly, we are scrolled to the left, so the action for the current trade is occurring offscreen to the right somewhere.

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