    function setAlchemist(address _alchemist) external override onlyAdmin {
        sources[alchemist] = false;
        sources[_alchemist] = true;
    function setAlchemist(address _alchemist) external override onlyAdmin {
+		  require(getTotalCredit() == 0, "Credit exists with old Alchemist");
+       for (uint256 j = 0; j < registeredUnderlyings.length; j++) {
+           require(getTotalUnderlyingBuffered[registeredUnderlyings[j]] == 0, "Buffer exists with old Alchemist");
+       }
        sources[alchemist] = false;
