diff --git a/extensions/notebook/src/book/bookTreeView.ts b/extensions/notebook/src/book/bookTreeView.ts
index 17df14203d..afe4e48a40 100644
--- a/extensions/notebook/src/book/bookTreeView.ts
+++ b/extensions/notebook/src/book/bookTreeView.ts
@@ -203,8 +203,7 @@ export class BookTreeViewProvider implements vscode.TreeDataProvider<BookTreeIte
 	private runThrottledAction(resource: string, action: () => void) {
 		const isResourceChange = resource !== this._resource;
 		if (isResourceChange) {
-			clearTimeout(this._throttleTimer);
-			this._throttleTimer = undefined;
+			this.clearAndResetThrottleTimer();
 		}
 
 		this._resource = resource;
@@ -214,11 +213,19 @@ export class BookTreeViewProvider implements vscode.TreeDataProvider<BookTreeIte
 			if (isResourceChange) {
 				action();
 			} else {
-				this._throttleTimer = setTimeout(() => action(), 300);
+				this._throttleTimer = setTimeout(() => {
+					action();
+					this.clearAndResetThrottleTimer();
+				}, 300);
 			}
 		}
 	}
 
+	private clearAndResetThrottleTimer(): void {
+		clearTimeout(this._throttleTimer);
+		this._throttleTimer = undefined;
+	}
+
 	openExternalLink(resource: string): void {
 		try {
 			vscode.env.openExternal(vscode.Uri.parse(resource));