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guard event listener from null values

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This commit is contained in:
Germain Souquet 2021-05-28 17:37:29 +01:00
parent 18188538f6
commit fd69fce1ba
2 changed files with 4 additions and 4 deletions
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4
src/components/structures/LeftPanel.tsx
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@ -99,7 +99,7 @@ export default class LeftPanel extends React.Component<IProps, IState> {
UIStore.instance.on("ListContainer", this.refreshStickyHeaders);
// Using the passive option to not block the main thread
// https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener#improving_scrolling_performance_with_passive_listeners
this.listContainerRef.current.addEventListener("scroll", this.onScroll, { passive: true });
this.listContainerRef.current?.addEventListener("scroll", this.onScroll, { passive: true });
}
public componentWillUnmount() {
@ -111,7 +111,7 @@ export default class LeftPanel extends React.Component<IProps, IState> {
SpaceStore.instance.off(UPDATE_SELECTED_SPACE, this.updateActiveSpace);
UIStore.instance.stopTrackingElementDimensions("ListContainer");
UIStore.instance.removeListener("ListContainer", this.refreshStickyHeaders);
this.listContainerRef.current.removeEventListener("scroll", this.onScroll);
this.listContainerRef.current?.removeEventListener("scroll", this.onScroll);
}
public componentDidUpdate(prevProps: IProps, prevState: IState): void {