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I'm trying to make sure that, when my contract receives any token, send mine to the wallet of the person who sent it to the contract.

event Received(address, uint);
    receive() external payable {
    emit Received(msg.sender, msg.value);
    uint256 numTokens = msg.value * 1000;
    require(numTokens <= balances[msg.sender]);
    balances[address(this)] = balances[address(this)].sub(numTokens);
    balances[msg.sender] = balances[msg.sender].add(numTokens);
    emit Transfer(address(this), msg.sender,  numTokens);
} 

I'm doing this, but an error appears: Warning! Error encountered during contract execution [out of gas]

Transaction Details

What I find strange is that if I remove the line:

balances[msg.sender] = balances[msg.sender].add(numTokens);

The error does not happen, the quantity of the tokens in the contract decreases, but without the line I removed it does not update the wallet of who sent the tokens for the contract.

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