LoPy4 deepsleep gives guru meditation error

[Adriaan Adriaanssen]

I've been trying to get deepsleep working om my LoPy4. What I can find the machine.deepsleep([time_ms]) function puts the LoPy in deepsleep for x amount of seconds. I however get the following error: Guru Meditation Error: Core 1 panic'ed (LoadProhibited). Exception was unhandled. Any solutions?

import pycom
import time
from machine import Pin
from machine import ADC
from SEN0161_V2 import DFRobot_PH
from onewire import DS18X20
from onewire import OneWire

pycom.heartbeat(False)                              #Disable the heartbeat LED to conserve power

ow = OneWire(Pin('P10'))                            #DS18B20 data line connected to pin P10
temp = DS18X20(ow)

ph   = DFRobot_PH()                                 #create an PH sensor object
ph.begin()
adc = ADC(0)                                        #create an ADC object
adc_c = adc.channel(pin='P13', attn=ADC.ATTN_11DB)  #create an analog pin on P13 and set channel attenuation to 11dB which allows measurment up to 3.3V        
   
while True:
    time.sleep(1)
    temp.start_conversion()                         #Converts the data received on the one wire bus to a value
    temprature = temp.read_temp_async()             #converts the value to a temprature
    time.sleep(1)
    print(temprature)                               #prints the temprature
    time.sleep(1)

    adcvoltage = adc_c.voltage()                    #Reads the channels 12 bit value and converts it into a voltage (in millivolts)
    print(str(adcvoltage))
    # ph.calibration(adcvoltage)                    #Calibrate the pH sensor using the buffer solutions
    PH = ph.readPH(adcvoltage)                      #Reads the PH value of the solution
    print(str(PH))                                  #prints the PH value

    time.sleep(1)
    machine.deepsleep(10000)                        #go to sleep for 60 seconds

Guru Meditation Error: Core 1 panic'ed (LoadProhibited). Exception was unhandled.
Core 1 register dump:
PC : 0x400ffa9a PS : 0x00060130 A0 : 0x800e8383 A1 : 0x3ffd8e90
A2 : 0x00000000 A3 : 0x00000001 A4 : 0x00000000 A5 : 0x00000009
A6 : 0x00008000 A7 : 0x8000ffff A8 : 0x3f40fa0c A9 : 0x3ffd8e60
A10 : 0x00000000 A11 : 0x00000000 A12 : 0x3ff56960 A13 : 0x00000000
A14 : 0x3ffdec98 A15 : 0x00000001 SAR : 0x0000001e EXCCAUSE: 0x0000001c
EXCVADDR: 0x00000000 LBEG : 0x400ed52c LEND : 0x400ed56f LCOUNT : 0x00000000

ELF file SHA256: 0000000000000000000000000000000000000000000000000000000000000000

Backtrace: 0x400ffa9a:0x3ffd8e90 0x400e8380:0x3ffd8eb0 0x400e5aec:0x3ffd8ed0 0x4010214a:0x3ffd8f00 0x400fe4d5:0x3ffd8f30 0x400fe565:0x3ffd8f50 0x4010a537:0x3ffd8f70 0x401021e4:0x3ffd9010 0x400fe4d5:0x3ffd9080 0x400fe502:0x3ffd90a0 0x400e1661:0x3ffd90c0 0x400e1905:0x3ffd9160 0x400e0188:0x3ffd9180
================= CORE DUMP START =================