According to Lightning HSL, the instant pullback of UNI on the evening of the 23rd caused Compound to fail to update the price of UNI in time and adopt the wrong price provided by Uniswap TWAP (time weighted average price). In the agreement, collateral with a low UNI value can be used to borrow UNI , causing bad debts of US$660,000; currently Compound has initiated a vote to correct this bug.