Issue changing stop order price with latest NT release

Desktop SDK - Strategies
1

I have an issue when changing the stop order price. It throws an error saying it can’t be changed because the quantity can’t be less than one? It’s important to note that this code below hasn’t changed in months and it was working fine until recently… now this error started popping up just around the same time the latest NT version was released. I suspect something has changed in the NT backend that is causing it.

Here is the code I am using…

Order order = orders[LONG]; // get order from map

order.StopPriceChanged = Instrument.MasterInstrument.RoundToTickSize(price);

Account.Change(new[] { order });

Here is a pic of the error message…

Error
Error396×127 9.02 KB

Also here is my custom logging message…

INFO [ SimNT 3 6J DEC25 ] changing order: LongBreak price: 0.006511 to: 0.0065105

INFO [ SimNT 3 6J DEC25 ] OnOrderUpdate order: orderId=‘a3b8298fde784447837ceff96b56525f’ account=‘SimNT 3’ name=‘LongBreak’ orderState=ChangePending instrument=‘6J DEC25’ orderAction=Buy orderType=‘Stop Market’ limitPrice=0 stopPrice=0.006511 quantity=8 tif=Gtc oco=‘’ filled=0 averageFillPrice=0 onBehalfOf=‘’ id=42923 time=‘2025-11-11 17:48:58’ gtd=‘2099-12-01’ statementDate=‘2025-11-11’

INFO [ SimNT 3 6J DEC25 ] OnOrderUpdate order: orderId=‘a3b8298fde784447837ceff96b56525f’ account=‘SimNT 3’ name=‘LongBreak’ orderState=Accepted instrument=‘6J DEC25’ orderAction=Buy orderType=‘Stop Market’ limitPrice=0 stopPrice=0.006511 quantity=8 tif=Gtc oco=‘’ filled=0 averageFillPrice=0 onBehalfOf=‘’ id=42923 time=‘2025-11-11 17:48:58’ gtd=‘2099-12-01’ statementDate=‘2025-11-11’

Then it throws this error code…

ErrorCode.UnableToChangeOrder

Not sure why the popup message is talking about quantity when the code is only trying to change the stop price?

TIA

2

I just noticed that it skips the ChangeSubmitted state and goes straight to the Accepted state?

Usually when the strategy changed an order the flow used to be…

ChangePending
ChangeSubmitted
Accepted

4

unnamed
unnamed820×948 139 KB

I get the same.. Cost me $1500 real money today.

The red stop loss, results in that error, conseqently, it does not accept the stop loss, leaving my order exposed.

5

This issue is a NinjaTrader backend issue and is creating havoc on my strategies.

Where is the developer support we used to get in the old forums?

6

Maverick… your issue is different from the one I posted.

7

In case the NT developers see this it’s important to note that this issue is random. The first few stop price changes seem to go through ok on a fresh startup of the NT platform but then the issue starts appearing on every stop price change. Restarting the NT platform seems to get it working again but then the issue starts to repeat itself.

As mentioned above the backend is skipping the ChangeSubmitted state and going straight to the Accepted state which then results in the NT platform throwing the popup error message.

Usually when the strategy changed an order the flow used to be…

OnOrderUpdate event called:

ChangePending
ChangeSubmitted
Accepted

But when the error happens I am seeing only…

OnOrderUpdate event called:

ChangePending
Accepted

Then the error message appears.

Note that the code in the strategy we are using has not changed for months and worked fine until the latest NT release… rolling back to the previous NT platform release does not solve the issue so this must be an issue in the NT platform backend code (not the NT platform and not with our strategy).

TIA

8

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