loging in or updating a block cases crash and makes game unplayable

don't know exactly why it happen it may be RAM overload may not but for me it makes game unplayable "sometimes"

*What I expected to happen was game ran normal as always and be playable

*What actually happened was by updating a block or simply just login in cases a crash

Steps to Reproduce:
1. login to launcher then in world
2. update block and crash
3. or go in world then log out
4. then go back in and world may crash seconds after logging