My function in the contract:

function balanceOf(address _owner) public view returns (uint256) {
    require(_owner != address(0), "no owner addr");
    return ownershipTokenCount[_owner];

My js function:

return this.contract.deployed().then(deployed => {
  return deployed.balanceOf.call("0x0000000000000000000000000000000000000000");
}).catch(e => console.log(e));

When I call the js function it returns 3.963877391197344453575983046348115674221700746820753546331534351508065746944e+75 instead of printing out an error.

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