Some deductions from universal credit (UC) were temporarily suspended during the coronavirus pandemic. If you think you were having deductions taken from your UC, make sure you check if there was a break and if the deductions are currently still being made. Check your online UC journal.
If money was being taken to repay rent arrears and those deductions stopped, it might mean your arrears have increased. You will need to find another way to pay off what you owe. If you are unable to do that then you should contact your landlord immediately. You might be in breach of a court order if you don’t pay and you could risk being evicted.