El contrato de venta de tokens devuelve una excepción cada vez. Probado en ropsten y ahí está funcionando bien

El siguiente es el código para el token:

  pragma solidity ^0.4.16;

   interface tokenRecipient { function receiveApproval(address _from, uint256 
   _value, address _token, bytes _extraData) external; }

   contract CCTCOIN {

string public name;
string public symbol;
uint8 public decimals = 8;
uint256 public totalSupply;

mapping (address => uint256) public balanceOf;
mapping (address => mapping (address => uint256)) public allowance;


event Transfer(address indexed from, address indexed to, uint256 value);


event Burn(address indexed from, uint256 value);

constructor(

) public {
    totalSupply = 21000000 * 10 ** uint256(decimals);  
    balanceOf[msg.sender] = totalSupply;               
    name = "CCTCOIN";                                  
    symbol = "CCTC";                               
}


function _transfer(address _from, address _to, uint _value) internal {

    require(_to != 0x0);
    require(balanceOf[_from] >= _value);
    require(balanceOf[_to] + _value >= balanceOf[_to]);
    uint previousBalances = balanceOf[_from] + balanceOf[_to];
    balanceOf[_from] -= _value;
    balanceOf[_to] += _value;
    emit Transfer(_from, _to, _value);
    assert(balanceOf[_from] + balanceOf[_to] == previousBalances);
}


function transfer(address _to, uint256 _value) public {
    _transfer(msg.sender, _to, _value);
}


function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
    require(_value <= allowance[_from][msg.sender]);  
    allowance[_from][msg.sender] -= _value;
    _transfer(_from, _to, _value);
    return true;
}


function approve(address _spender, uint256 _value) public
    returns (bool success) {
    allowance[msg.sender][_spender] = _value;
    return true;
}


function approveAndCall(address _spender, uint256 _value, bytes _extraData)
    public
    returns (bool success) {
    tokenRecipient spender = tokenRecipient(_spender);
    if (approve(_spender, _value)) {
        spender.receiveApproval(msg.sender, _value, this, _extraData);
        return true;
    }
}

function burn(uint256 _value) public returns (bool success) {
    require(balanceOf[msg.sender] >= _value);   
    balanceOf[msg.sender] -= _value;          
    totalSupply -= _value;                      
    emit Burn(msg.sender, _value);
    return true;
}


function burnFrom(address _from, uint256 _value) public returns (bool success) {
    require(balanceOf[_from] >= _value);                
    require(_value <= allowance[_from][msg.sender]);    
    balanceOf[_from] -= _value;                         
    allowance[_from][msg.sender] -= _value;             
    totalSupply -= _value;                              
    emit Burn(_from, _value);
    return true;
}
}

Este es el código para el contrato de distribución de tokens, la tasa es fija y cuando se ejecuta en ropsten, funciona bien con cualquier dirección de token, pero en la red principal siempre genera una excepción:

pragma solidity ^0.4.0;


// ----------------------------------------------------------------------------
// Safe maths
// ----------------------------------------------------------------------------
contract SafeMath {
    function safeAdd(uint a, uint b) internal pure returns (uint c) {
        c = a + b;
        require(c >= a);
    }
    function safeSub(uint a, uint b) internal pure returns (uint c) {
        require(b <= a);
        c = a - b;
    }
    function safeMul(uint a, uint b) internal pure returns (uint c) {
        c = a * b;
        require(a == 0 || c / a == b);
    }
    function safeDiv(uint a, uint b) internal pure returns (uint c) {
        require(b > 0);
        c = a / b;
    }
}


interface token {
    function transfer(address to, uint tokens) external;
    function balanceOf(address tokenOwner) external returns(uint balance);
}





// ----------------------------------------------------------------------------
// Owned contract
// ----------------------------------------------------------------------------
contract Owned {
    address public owner;
    address public newOwner;

    event OwnershipTransferred(address indexed _from, address indexed _to);

    constructor() public {
        owner = msg.sender;
    }

    modifier onlyOwner {
        require(msg.sender == owner);
        _;
    }

    function transferOwnership(address _newOwner) public onlyOwner {
        newOwner = _newOwner;
        emit OwnershipTransferred(owner, _newOwner);
    }

}

contract CCTCSALE is  Owned, SafeMath {


    token public reward;
    uint public Ownerbalance;

    mapping(address => uint) balances;



    constructor() public {
        address CCTCTokenAddress = 0x5f9f9c3148ca875fc28b4075cc3195f7e040a1a4;

        reward = token(CCTCTokenAddress);

    }
    function getbalance() public returns(uint) {
        uint test = reward.balanceOf(this);
        return (test);
    }

    function () public payable {

        uint tokens;
        tokens = msg.value * 500;
        balances[msg.sender] = safeAdd(balances[msg.sender], tokens);
        reward.transfer(msg.sender, tokens);
    }

    function safeWithdrawal() public onlyOwner {
            uint amount = this.balance;
            owner.transfer(amount);
    }


    function withdrawTokens() public onlyOwner{
        Ownerbalance = reward.balanceOf(this);
        reward.transfer(owner, Ownerbalance);

    }

}