Cannot read property removeEventListener of null (#163)

Author: gugods

src/List.tsx

@@ -277,9 +277,11 @@ export function RawList<T>(props: ListProps<T>, ref: React.Ref<ListRef>) {
     componentRef.current.addEventListener('MozMousePixelScroll', onMozMousePixelScroll);
 
     return () => {
-      componentRef.current.removeEventListener('wheel', onRawWheel);
-      componentRef.current.removeEventListener('DOMMouseScroll', onFireFoxScroll as any);
-      componentRef.current.removeEventListener('MozMousePixelScroll', onMozMousePixelScroll as any);
+      if(componentRef.current) {
+        componentRef.current.removeEventListener('wheel', onRawWheel);
+        componentRef.current.removeEventListener('DOMMouseScroll', onFireFoxScroll as any);
+        componentRef.current.removeEventListener('MozMousePixelScroll', onMozMousePixelScroll as any);
+      }
     };
   }, [useVirtual]);
 

src/hooks/useMobileTouchMove.ts

@@ -74,7 +74,9 @@ export default function useMobileTouchMove(
     }
 
     return () => {
-      listRef.current.removeEventListener('touchstart', onTouchStart);
+      if(listRef.current) {
+        listRef.current.removeEventListener('touchstart', onTouchStart);
+      }
       cleanUpEvents();
       clearInterval(intervalRef.current);
     };