diff --git a/src/vs/workbench/contrib/notebook/common/notebookProvider.ts b/src/vs/workbench/contrib/notebook/common/notebookProvider.ts
index 4f1587380adf1ceb5de203acc9d71784f683804d..2a6a2beb211c29895939bbeac100fb6474842ac6 100644
--- a/src/vs/workbench/contrib/notebook/common/notebookProvider.ts
+++ b/src/vs/workbench/contrib/notebook/common/notebookProvider.ts
@@ -54,7 +54,7 @@ export class NotebookProviderInfo implements NotebookEditorDescriptor {
 	}
 
 	matches(resource: URI): boolean {
-		return this.selectors.some(selector => NotebookProviderInfo.selectorMatches(selector, resource));
+		return this.selectors?.some(selector => NotebookProviderInfo.selectorMatches(selector, resource));
 	}
 
 	static selectorMatches(selector: NotebookSelector, resource: URI): boolean {