From 4a941f2e582dbb6991f2c350eb19dfd44ec329b6 Mon Sep 17 00:00:00 2001
From: rebornix <penn.lv@gmail.com>
Date: Wed, 29 Apr 2020 11:16:31 -0700
Subject: [PATCH] :lipstick:

---
 .../contrib/notebook/browser/notebook.contribution.ts         | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/vs/workbench/contrib/notebook/browser/notebook.contribution.ts b/src/vs/workbench/contrib/notebook/browser/notebook.contribution.ts
index f09d936385c..0a413ca9a13 100644
--- a/src/vs/workbench/contrib/notebook/browser/notebook.contribution.ts
+++ b/src/vs/workbench/contrib/notebook/browser/notebook.contribution.ts
@@ -164,10 +164,10 @@ export class NotebookContribution implements IWorkbenchContribution {
 		}
 
 		if (id === undefined) {
-			const existingEditors = group.editors.filter(editor => editor.resource && isEqual(editor.resource, resource));
+			const existingEditors = group.editors.filter(editor => editor.resource && isEqual(editor.resource, resource) && !(editor instanceof NotebookEditorInput));
 
 			if (existingEditors.length) {
-				return;
+				return undefined;
 			}
 
 			const userAssociatedEditors = this.getUserAssociatedEditors(resource);