When creating a listing the listVesting() function do not check if the _discountPct is less than 10000 which is the 100%. Therefore, if the _discountPct > 10000 No one will be able to buy a listing due to a revert in the _getDiscountedPrice() function.
As you can see in the listVesting() there is no check if the _discountPct is higher than 10000 which allow user to make a listing with higher _discountPct values:
SecondSwap_Marketplace::listVesting()
SecondSwap_VestingManager::listVesting()
