From a3fe14998f330d4840dea667ace414374dfd8a56 Mon Sep 17 00:00:00 2001
From: Martin Aeschlimann <martinae@microsoft.com>
Date: Mon, 26 Jun 2017 15:16:03 +0800
Subject: [PATCH] TypeError: Cannot read property 'getText' of null. Fixes
 Microsoft/monaco-editor#354

---
 src/cssWorker.ts | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/cssWorker.ts b/src/cssWorker.ts
index d7ce2719..3eaa2df8 100644
--- a/src/cssWorker.ts
+++ b/src/cssWorker.ts
@@ -43,9 +43,12 @@ export class CSSWorker {
 
     doValidation(uri: string): Promise<ls.Diagnostic[]> {
 		let document = this._getTextDocument(uri);
-		let stylesheet = this._languageService.parseStylesheet(document);
-		let diagnostics = this._languageService.doValidation(document, stylesheet);
-		return Promise.as(diagnostics)
+		if (document) {
+			let stylesheet = this._languageService.parseStylesheet(document);
+			let diagnostics = this._languageService.doValidation(document, stylesheet);
+			return Promise.as(diagnostics)
+		}
+		return Promise.as([]);
 	}
     doComplete(uri: string, position: ls.Position): Promise<ls.CompletionList> {
 		let document = this._getTextDocument(uri);