message: Prevent soft crash when sending a thread message
diff: @@ -590,7 +590,7 @@ class TimelinePanel extends React.Component<IProps, IState> {
  }
  this.setState<null>(updatedState, () => {
  - this.messagePanel.current.updateTimelineMinHeight();
  + this.messagePanel.current?.updateTimelineMinHeight();
  if (callRMUpdated) {
  this.props.onReadMarkerUpdated?.();
  }
  