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We have a contract that is in production already and has a getPerson() function. This is a public function that returns 12 uint256 values. We are attempting to call this function from another contract as follows:

function _getPerson(uint256 _personId) private returns (uint256) {
    uint256 a;
    uint256 b;
    uint256 c;
    uint256 d;
    uint256 e;
    uint256 f;
    uint256 g;
    uint256 h;
    uint256 i;
    uint256 j;
    uint256 k;
    uint256 l;

    (a, b, c, d, e, f, g, h, i, j, k, l) = personContract.getPerson(_personId);

    return a;
}

But we get the following compiler warning on the line that we call getPerson:

Compiler Error: Stack too deep. Try removing local variables.

Is there any way to get around this? Redeploying isn't the contract is a pretty bad option for us as there is a lot of data to move over.

Also, I don't quite understand why I have this issue as the limit should be 12 and the contract I'm calling does work fine when it returns the tuple of size 12.

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  • 2
    You don't need to declare all variables and use only one, you can skip using only the commas (a,,,,,,,,,,,). Just make sure to count all commas correctly Commented Feb 3, 2018 at 21:32

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