/Javascript/React/Reactjs typeError: Cannot read property 'offsetHeight' of null

Reactjs typeError: Cannot read property 'offsetHeight' of null

  handleResize = () => {
    let highestSlide = 0;

    this.refArray.forEach(ref => {
      if (ref.current && highestSlide < ref.current.offsetHeight) {
        highestSlide = ref.current.offsetHeight;
      }
    });
  };

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Error Invalid regular expression: /(.*\\__fixtures__\\.*|node_modules[\\\]react[\\\]dist[\\\].*|website\\node_modules\\.*|heapCapture\\bundle\.js|.*\\__tests__\\.*)$/: Unterminated character class.
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