[FIX] Scroll to top crashing when ref is undefined (#2252)

* [FIX] Check if exists scroll ref

* Remove scrollTo

Co-authored-by: Diego Mello <diegolmello@gmail.com>

app/views/RoomView/index.js

@@ -769,7 +769,7 @@ class RoomView extends React.Component {
 			if (handleCommandScroll(event)) {
 				const offset = input === 'UIKeyInputUpArrow' ? 100 : -100;
 				this.offset += offset;
-				this.flatList.scrollToOffset({ offset: this.offset });
+				this.flatList?.scrollToOffset({ offset: this.offset });
 			} else if (handleCommandRoomActions(event)) {
 				this.goRoomActionsView();
 			} else if (handleCommandSearchMessages(event)) {

app/views/RoomsListView/index.js

@@ -512,12 +512,7 @@ class RoomsListView extends React.Component {
 			this.setHeader();
 			closeSearchHeader();
 			setTimeout(() => {
-				const offset = 0;
+				this.scrollToTop();
-				if (this.scroll.scrollTo) {
-					this.scroll.scrollTo({ x: 0, y: offset, animated: true });
-				} else if (this.scroll.scrollToOffset) {
-					this.scroll.scrollToOffset({ offset });
-				}
 			}, 200);
 		});
 	};
@@ -546,9 +541,7 @@ class RoomsListView extends React.Component {
 			search: result,
 			searching: true
 		});
-		if (this.scroll && this.scroll.scrollTo) {
+		this.scrollToTop();
-			this.scroll.scrollTo({ x: 0, y: 0, animated: true });
-		}
 	}, 300);
 
 	getRoomTitle = item => RocketChat.getRoomTitle(item)
@@ -569,15 +562,16 @@ class RoomsListView extends React.Component {
 		this.goRoom({ item, isMasterDetail });
 	};
 
+	scrollToTop = () => {
+		if (this.scroll?.scrollToOffset) {
+			this.scroll.scrollToOffset({ offset: 0 });
+		}
+	}
+
 	toggleSort = () => {
 		const { toggleSortDropdown } = this.props;
 
-		const offset = 0;
+		this.scrollToTop();
-		if (this.scroll.scrollTo) {
-			this.scroll.scrollTo({ x: 0, y: offset, animated: true });
-		} else if (this.scroll.scrollToOffset) {
-			this.scroll.scrollToOffset({ offset });
-		}
 		setTimeout(() => {
 			toggleSortDropdown();
 		}, 100);