I forgot to turn off malwarebytes free trial when running first time scanning. Which means MB and avast run in real-time together because MB free trial have a feature to run in real-time not like the free version this what they said in the forum. Is it fine? i just remove MB after finishing scanning and so far my PC just fine. I am afraid about conflict between this two since they run in real-time together.
Regarding Avast & Malwarebytes, see: https://forums.malwarebytes.com/topic/200324-exclusions-for-avast-users/
You can also change the settings in Malwarebytes so that it’s not resident. Run MB manually when ever you want a double check.