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fix container is undefined error
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@ -101,6 +101,7 @@ class App extends React.Component {
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};
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};
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componentWillUnmount() {
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componentWillUnmount() {
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const { container } = this.refs;
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container.removeEventListener('drop', this.onDrop);
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container.removeEventListener('drop', this.onDrop);
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}
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}
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