/Javascript/React/Cannot read properties of undefined (reading 'length') selectionlist react native

Cannot read properties of undefined (reading 'length') selectionlist react native

fetch('https://obscure-reaches-65656.herokuapp.com/api/getCloseTime?city=Hsinchu&sTime=18&eTime=21')
.then(r => r.json())
.then(r => {
  const movieData = r.reduce((r,s) => {
    r.push({title: s.theater, data: s.movie});
    return r;
  }, []);

  this.setState({ movieData });
});

Source: stackoverflow.com

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