Basket.sol#auctionBurn calculates ibRatio wrong

Handle 0x0x0x Vulnerability details The function is implemented as follows: function auctionBurnuint256 amount onlyAuction nonReentrant external override uint256 startSupply = totalSupply; handleFeesstartSupply; burnmsg.sender, amount; uint256 newIbRatio = ibRatio startSupply / startSupply -...