message: Check for valid reference.
diff: @@ -90,8 +90,10 @@ export default class Stickerpicker extends React.Component {
  }
  componentWillUnmount() {
  + if (this.dispatcherRef) {
  dis.unregister(this.dispatcherRef);
  }
  + }
  _imError(errorMsg, e) {
  console.error(errorMsg, e);
  