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I am trying to do an Auction project and this part is bugging me. I can't figure out what is the problem that's causing the following error message: "VM error: invalid opcode.". Even if I do this simple smart contact I get the same error message. So I would like it if someone can figure out what is the problem with the provided smart contract. Thanks!

// SPDX-License-Identifier: UNLICENSED
pragma solidity >=0.6.0 < 0.7.0;

contract testing {
    
    mapping(address => uint256[]) fundsByBidder;
    mapping(uint256 => uint256) newBidToGoods;
     
    function update(uint256 _goodsId) public payable {
        newBidToGoods[_goodsId] = fundsByBidder[msg.sender][_goodsId] + msg.value;
    }
    
    function show(uint256 _goodsId) public view returns(uint256) {
        return newBidToGoods[_goodsId];
    }
}
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    Because fundsByBidder[msg.sender].length is not larger than _goodsId. – goodvibration Jul 25 at 15:31
  • @goodvibration Can you help me out a bit more? I'm not sure that I fully understand what is the problem and how to fix it. – Nikola Jul 25 at 15:43
  • The length of your array is 0, so you cannot access any element in it. – goodvibration Jul 25 at 16:26
  • @goodvibration Thanks! – Nikola Jul 25 at 16:42
  • Invalid opcode is similar to "runtime exception." – hrkrshnn Jul 26 at 17:51
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Because fundsByBidder[msg.sender].length is not larger than _goodsId.

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