Presale contract thro error "out of gas" when I tried to send in bnb

Hello fellow dev,
I am running into error on my presale smart contract.

The smart contract was meant to send out token equivalent of the BNB I sent to the smart contract.

The error is when I sent bnb to the presale smart contract, it thro error: out of gas.

I dont know what's the specific is.

Deploed Presale Address: 0xf0576AAa06871B08A55Bd9B5834e0a2bcbBA6F11

Main Token Address: 0x63d24d94b9AE7912949dAFAe43387f75C379f251

Your help is highly appreciated.


pragma solidity 0.8.16;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

contract CrypToCashXICO {
    //Administration Details
    address public admin;
    address payable public ICOWallet;

    IERC20 public token;

    //ICO Details
    uint public tokenPrice = 0.00051 ether;
    uint public hardCap = 5000 ether;
    uint public raisedAmount;
    uint public minInvestment = 0.0016 ether;
    uint public maxInvestment = 4 ether;
    uint public icoStartTime;
    uint public icoEndTime;

    mapping(address => uint) public investedAmountOf;

    //ICO State
    enum State {
    State public ICOState;

    event Invest(
        address indexed from,
        address indexed to,
        uint value,
        uint tokens
    event TokenBurn(address to, uint amount, uint time);

    //Initialize Variables
    constructor(address payable _icoWallet, address _token) {
        admin = msg.sender;
        ICOWallet = _icoWallet;
        token = IERC20(_token);

    //Access Control
    modifier onlyAdmin() {
        require(msg.sender == admin, "Admin Only function");

    //Receive Ether Directly
    receive() external payable {

    fallback() external payable {

    /* Functions */

    //Get ICO State
    function getICOState() external view returns (string memory) {
        if (ICOState == State.BEFORE) {
            return "Not Started";
        } else if (ICOState == State.RUNNING) {
            return "Running";
        } else if (ICOState == State.END) {
            return "End";
        } else {
            return "Halted";

    /* Admin Functions */

    //Start, Halt and End ICO
    function startICO() external onlyAdmin {
        require(ICOState == State.BEFORE, "ICO isn't in before state");

        icoStartTime = block.timestamp;
        icoEndTime = icoStartTime + (86400 * 365);
        ICOState = State.RUNNING;

    function haltICO() external onlyAdmin {
        require(ICOState == State.RUNNING, "ICO isn't running yet");
        ICOState = State.HALTED;

    function resumeICO() external onlyAdmin {
        require(ICOState == State.HALTED, "ICO State isn't halted yet");
        ICOState = State.RUNNING;

    //Change ICO Wallet
    function changeICOWallet(address payable _newICOWallet) external onlyAdmin {
        ICOWallet = _newICOWallet;

    //Change Admin
    function changeAdmin(address _newAdmin) external onlyAdmin {
        admin = _newAdmin;

    /* User Function */
    function invest() public payable returns (bool) {
        require(ICOState == State.RUNNING, "ICO isn't running");
            msg.value >= minInvestment && msg.value <= maxInvestment,
            "Check Min and Max Investment"
            investedAmountOf[msg.sender] + msg.value <= maxInvestment,
            "Investor reached maximum Investment Amount"

            raisedAmount + msg.value <= hardCap,
            "Send within hardcap range"
            block.timestamp <= icoEndTime,
            "ICO already Reached Maximum time limit"

        raisedAmount += msg.value;
        investedAmountOf[msg.sender] += msg.value;

        (bool transferSuccess, ) ={value: msg.value}("");
        require(transferSuccess, "Failed to Invest");

        uint tokens = (msg.value / tokenPrice) * 1e18;
        bool saleSuccess = token.transfer(msg.sender, tokens);
        require(saleSuccess, "Failed to Invest");

        emit Invest(address(this), msg.sender, msg.value, tokens);
        return true;

    //Burn Tokens
    function burn() external returns (bool) {
        require(ICOState == State.END, "ICO isn't over yet");

        uint remainingTokens = token.balanceOf(address(this));
        bool success = token.transfer(address(0), remainingTokens);
        require(success, "Failed to burn remaining tokens");

        emit TokenBurn(address(0), remainingTokens, block.timestamp);
        return true;

    //End ICO After reaching Hardcap or ICO Timelimit
    function endIco() public {
        require(ICOState == State.RUNNING, "ICO Should be in Running State");
            block.timestamp > icoEndTime || raisedAmount >= hardCap,
            "ICO Hardcap or timelimit not reached"
        ICOState = State.END;

    //Check ICO Contract Token Balance
    function getICOTokenBalance() external view returns (uint) {
        return token.balanceOf(address(this));

    //Check ICO Contract Investor Token Balance
    function investorBalanceOf(address _investor) external view returns (uint) {
        return token.balanceOf(_investor);

out of gas means what it says, the execution ran out of gas which means that you need to provide more gas, increase your transaction fee

I have increased, yet, it didn't work

This is the presale address: 0xf0576AAa06871B08A55Bd9B5834e0a2bcbBA6F11

You can try and send test BNB to it.

And see it yourself.

also in the invest function also always do multiplication before divison
so instead of

uint tokens = (msg.value / tokenPrice) * 1e18;

use this

uint tokens = msg.value * 1e18 / tokenPrice;

also instead of call you can just use payable(address).transfer(amount) and then put it into a require statement.
I normally don't use call so maybe the contract fails because of it because I cannot call the function even tho it looks okay. So just change it to .transfer instead of .call