File: protocol/contracts/Controller.sol   #1

35:           require(_inflationManager != address(0), Error.INVALID_ARGUMENT);
File: protocol/contracts/tokenomics/InflationManager.sol   #2

60:           require(_minter != address(0), Error.INVALID_MINTER);
File: protocol/contracts/tokenomics/VestedEscrowRevocable.sol   #3

54:           require(_recipient != treasury, "Treasury cannot be revoked!");
