do nothing when ref is null

Author: vipierozan99

packages/mui-material/src/useScrollTrigger/useScrollTrigger.d.ts

@@ -1,6 +1,6 @@
 export interface UseScrollTriggerOptions {
   disableHysteresis?: boolean;
-  target?: Node | Window;
+  target?: Node | Window | null;
   threshold?: number;
 }
 

packages/mui-material/src/useScrollTrigger/useScrollTrigger.js

@@ -26,6 +26,7 @@ export default function useScrollTrigger(options = {}) {
   const store = React.useRef();
   const [trigger, setTrigger] = React.useState(() => getTrigger(store, other));
   React.useEffect(() => {
+    if (target === null) return
     const handleScroll = () => {
       setTrigger(getTrigger(store, { target, ...other }));
     };