TypeError: output is undefined

[Obertura777]

Getting the following error while looking at a specific season in a game.

intersection
src/gui/maps/common/equilateralTriangle.js:118

  115 |         }
  116 |         distances.sort();
  117 |         const output = distances[0];
> 118 |         output.shift();
      | ^  119 |         return output;
  120 |     }
  121 | }

render
src/gui/maps/common/convoy.js:23

  20 | import PropTypes from "prop-types";
  21 | 
  22 | export class Convoy extends React.Component {
> 23 |     render() {
  24 |         const Coordinates = this.props.coordinates;
  25 |         const SymbolSizes = this.props.symbolSizes;
  26 |         const Colors = this.props.colors;

It seems some sort of interface error in computing convoy arrangements.