Invalid BigNumber value for string

When I try to run the pin function that takes an integer, i keep getting this error

invalid BigNumber value (argument="value", value=undefined, code=INVALID_ARGUMENT, version=bignumber/5.7.0)

frontend code:

    const abi = [
      "function pinGem(uint256 tokenId, string memory latitude, string memory longitude) public"
    const contract = new ethers.Contract(contractAddress, abi, signer);
    try {
      const latitude =;
      const longitude = pinnedPosition.lng.toString();

      const tx = await contract.pinGem(nft.tokenId, latitude, longitude);


i tried using uint256, but kept getting the same error then switched to strings and still got the same error.

// Compatible with OpenZeppelin Contracts ^5.0.0
pragma solidity ^0.8.20;

   struct Gem {
        uint256 id;
        string latitude;
        string longitude;

 function pin(uint256 tokenId, string memory latitude, string memory longitude) public {
        require(ownerOf(tokenId) != address(0), "Token ID does not exist");
        pins[tokenId] = Pin(tokenId, latitude, longitude);

i was passing then ID oops