
function doYield(ILock token,address from,address to,uint256 amount) private {
..
    uint256 totalAmount = ps.lockToken.totalSupply();
..
    if (totalAmount > 0) {
      ineglible_yield_amount = ps.sWeight.mul(amount).div(totalAmount);
    } else {
      ineglible_yield_amount = amount;
    }
    if (from != address(0)) {
      uint256 raw_amount = ps.sWeight.mul(userAmount).div(totalAmount);  // totalAmount could be 0, see lines above


function activateCooldown(uint256 _amount, IERC20 _token) external override returns (uint256) {
...   uint256 tokenAmount = fee.mul(LibPool.stakeBalance(ps)).div(ps.lockToken.totalSupply());   // ps.lockToken.totalSupply() might be 0


 function unstake( uint256 _id, address _receiver, IERC20 _token ) external override returns (uint256 amount) {
...    amount = withdraw.lock.mul(LibPool.stakeBalance(ps)).div(ps.lockToken.totalSupply());  // // ps.lockToken.totalSupply() might be 0


 function stake( PoolStorage.Base storage ps,uint256 _amount, address _receiver ) external returns (uint256 lock) {
...      lock = _amount.mul(totalLock).div(stakeBalance(ps));   // stakeBalance(ps) might be 0
