Spark Core Crash

// This #include statement was automatically added by the Spark IDE.
#include "HttpClient/HttpClient.h"

// This #include statement was automatically added by the Spark IDE.
#include "OneWire/OneWire.h"

// This #include statement was automatically added by the Spark IDE.
#include "pid/pid.h"

// This #include statement was automatically added by the Spark IDE.
#include "spark-dallas-temperature/spark-dallas-temperature.h"

#define ONE_WIRE_BUS D1
#define TEMPERATURE_PRECISION 12
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);
// PID: variables
double pointTemperature = 0, actualTemperature, pidOutput;
int heating = 0;
//void update18B20Temp(DeviceAddress deviceAddress, double &tempC);
void update18B20Temp(double &tempC);

// Misc Stuff
unsigned long lastUpdate = 0;
unsigned long updateDelay = 10000;

// SparkCloud variable outputs
char tempInfo[64];
char pointInfo[64];
char pwmInfo[64];
char allInfo[64];

HttpClient http;
#define VARIABLE_ID "MY VARIABLE ID"
#define TOKEN "MY TOKEN"
http_header_t headers[] = {
      { "Content-Type", "application/json" },
      { "X-Auth-Token" , TOKEN },
    { NULL, NULL } // NOTE: Always terminate headers will NULL
};

http_header_t headersCooker[] = {
    //  { "Content-Type", "application/json" },
    //  { "Accept" , "application/json" },
    { "Accept" , "*/*"},
    { NULL, NULL } // NOTE: Always terminate headers will NULL
};

http_request_t request, requestCooker;
http_response_t response, responseCooker;

//PID myPID(&Input, &Output, &Setpoint,2,5,1, PID::DIRECT);
PID myPID(&actualTemperature, &pidOutput, &pointTemperature, 25, 1000, 9, PID::DIRECT);

void setup() {
    //Serial.begin(9600);
    //Serial.println("Dallas Temperature IC Control Library Demo");

    sensors.begin();
    //sensors.setResolution(thermometer, TEMPERATURE_PRECISION);
    sensors.setResolution(TEMPERATURE_PRECISION);

    // SparkCloud: variables
    Spark.variable("temperature", &tempInfo, STRING);
    Spark.variable("point", &pointInfo, STRING);
    Spark.variable("pwm", &pwmInfo, STRING);
    Spark.variable("heating", &heating, INT);
    Spark.variable("result",&allInfo, STRING);

    // SparkCloud: functions
    Spark.function("setPoint", setPointTemperature);

    //turn the PID on
    myPID.SetMode(PID::AUTOMATIC);

    request.hostname = "things.ubidots.com";
    request.port = 80;

    requestCooker.hostname = "MY_WEBSITE";
    requestCooker.port = MY_PORT_NUMBER;
}

void loop() {

    // Send event to the SparkCloud
    unsigned long now = millis();
    if((now - lastUpdate) > updateDelay)
    {
        lastUpdate = now;

        sensors.requestTemperatures();
        update18B20Temp(actualTemperature);

        // Compute PID
        if(myPID.Compute()) {

            // Turn on or off relay here
            if(pidOutput == 255 && !heating) {
                heating = 1;
                //turn heating on
                requestCooker.path = "/lights/cooker_on";
                http.get(requestCooker, responseCooker, headersCooker);
            } else if(pidOutput == 0 && heating) {
                heating = 0;
                //turn heating off
                requestCooker.path = "/lights/cooker_off";
                http.get(requestCooker, responseCooker, headersCooker);
            }
        }

        // Convert values for output
        // convert pidOutput to 0-100
        sprintf(allInfo, "{\"temp\":%2.2f,\"set\":%2.2f,\"pid\":%2.2f,\"heating\":%d}", actualTemperature, pointTemperature, (pidOutput / 255) * 100, heating);


        // Send to Ubidots
        if (pointTemperature) {
            request.path = "/api/v1.6/variables/"VARIABLE_ID"/values";
            request.body = "{\"value\":" + String(actualTemperature) + "}";
            http.post(request, response, headers);
        }

        // SparkCore: publish
        //Spark.publish("allInfo", allInfo);
        //Spark.publish("heating", heating);
    }

}

//void update18B20Temp(DeviceAddress deviceAddress, double &tempC)
void update18B20Temp(double &tempC)
{
  double tmp = sensors.getTempFByIndex(0);
  if(tmp > 0)
    tempC = tmp;
}

// set point temperature
int setPointTemperature(String command)
{
    // Convert to double
    pointTemperature = (double) command.toInt();
    return 1;
}