Unhandled Exception on Fenix 8 47mm - How to handle it correctly?

How does the code block where the unhandled exception occurs look?

function getPressure(pressureUnits) {
	try {
		var freeMem = Sys.getSystemStats().freeMemory.toNumber();
		var senIterator = null;
		var senHistory = null;
		var senSample = null;
		var senValue = 0;
		pInd = " ";		// global to show pressure going up/down/steady

		if (freeMem > 1000) {
			if (Toybox.SensorHistory has :getPressureHistory) {
=== error ==>	senIterator = new Lang.Method(Toybox.SensorHistory, :getPressureHistory);
				senHistory = (senIterator == null) ? null : senIterator.invoke({:order=>SensorHistory.ORDER_NEWEST_FIRST});
				senSample = (senHistory == null) ? null : senHistory.next();
				senValue = (senSample == null) ? 0 : (senSample.data == null) ? 0 : senSample.data;
				var nowMin4 = new Time.Moment(Time.today().value());
				var fourHours = new Time.Duration(-4 * Greg.SECONDS_PER_HOUR);
				nowMin4 = nowMin4.add(fourHours);					
				senSample = senHistory.next();
				while (senSample != null) {
					if (senSample has :data and senSample has :when) {
						if (senSample.when == null
						or  senSample.data == null) {
							break;
						}
						if (senSample.when.greaterThan(nowMin4)) {
							if (senSample.data > senValue) {
								pInd = "+";
								break;
							} else if (senSample.data < senValue) {
								pInd = "-";
								break;
							} else if (senSample.data == senValue) {
								pInd = "=";
							}

							senSample = senHistory.next();
						} else {
							break; // exit loop if history more than 4 hours old
						} // end if history is from last 4 hours
					}

					break; // exit loop if senSample does not have data or time
				} // while loop
			} // end if SensorHistory as getPressureHistory - some devices have SensorHistory but not all methods.
		} // end device has enough memory to do fetch
		senValue = checkRange(senValue, 95000.0, 105000.0);
		return (pressureUnits == Sys.UNIT_METRIC) ? senValue.toFloat()/100.00 : senValue.toFloat()*0.0002952;
	}catch (ex) {
		return 0;
	}
} // end getPressure

 Uncatchable Unhandled Exception  

Yep, I saw that one. Unfortunately no one replied to that with a meaningful answer! Your example is even harder to understand why it has not been caught.