Micropython bme.data.gas_resistance always exact same reading (-1.986394e+07 Ohms) #43

import bme680
from i2c import I2CAdapter
import machine

i2c_dev = I2CAdapter(scl=machine.Pin(22),sda=machine.Pin(21))
sensor = bme680.BME680(i2c_device=i2c_dev)

sensor.set_humidity_oversample(bme680.OS_2X)
sensor.set_pressure_oversample(bme680.OS_4X)
sensor.set_temperature_oversample(bme680.OS_8X)
sensor.set_filter(bme680.FILTER_SIZE_3)

sensor.set_gas_status(bme680.ENABLE_GAS_MEAS)
sensor.set_gas_heater_temperature(320)
sensor.set_gas_heater_duration(150)
sensor.select_gas_heater_profile(0)

while True:
    if sensor.get_sensor_data():
        output = "{0:.2f} C,{1:.2f} hPa,{2:.2f} %RH".format(sensor.data.temperature, sensor.data.pressure, sensor.data.humidity)

        if sensor.data.heat_stable:
            print("{0},{1} Ohms".format(output, sensor.data.gas_resistance))

        else:
            print(output)

    time.sleep(1)