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paper trading crashes part way through

Hi guys, i got a crash report on one of my algos, however the crash occurred several days into paper trading. thing is, the line that invoked the error is supposed to be execute only once, and only at the very beginning of any test to build up a look up table. for paper trading, is the backtest data updated every day? that is, is a new backtest instance invoked every day, thereby crossing into the "run once" section of my code?