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[USER=82525]@TraderJimmy[/USER] I am guessing that it detects that the stock is no longer trading (delisted)

[ATTACH=full]107837[/ATTACH]

with Norgate data you do not need to do this (as shown below)

How do I exit a position in a backtest prior to a stock being delisted?

Assuming a trade delay of 1 bar, you need to have an "exit" signal on the second last bar to simulate exiting a delisted stock. This will cause AmiBroker to exit the position on the final day of trading. You also want to avoid entering any new positions during the final 2 days.

OnSecondLastBarOfDelistedSecurity = !IsNull(GetFnData("DelistingDate")) AND (BarIndex() == (LastValue(BarIndex()) -1) OR DateTime() >= GetFnData("DelistingDate") ) ;

OnLastTwoBarsOfDelistedSecurity = !IsNull(GetFnData("DelistingDate")) AND (BarIndex() >= (LastValue(BarIndex()) -1) OR DateTime() >= GetFnData("DelistingDate") );