Do not crash if logger cannot be created

src/vs/platform/log/node/spdlogService.ts

@@ -25,6 +25,11 @@ export function createSpdLogService(processName: string, logLevel: LogLevel, log
 	return new NullLogService();
 }
 
+export function createRotatingLogger(name: string, filename: string, filesize: number, filecount: number): spdlog.RotatingLogger {
+	const _spdlog: typeof spdlog = require.__$__nodeRequire('spdlog');
+	return new _spdlog.RotatingLogger(name, filename, filesize, filecount);
+}
+
 class SpdLogService extends AbstractLogService implements ILogService {
 
 	_serviceBrand: any;

src/vs/platform/output/node/outputAppender.ts

@@ -2,15 +2,30 @@
  *  Copyright (c) Microsoft Corporation. All rights reserved.
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
+import { createRotatingLogger } from 'vs/platform/log/node/spdlogService';
 import { RotatingLogger } from 'spdlog';
 
+interface Appender {
+	critical(content: string);
+	flush();
+}
+
 export class OutputAppender {
 
-	private appender: RotatingLogger;
+	private appender: Appender;
 
 	constructor(name: string, file: string) {
-		this.appender = new RotatingLogger(name, file, 1024 * 1024 * 30, 1);
-		this.appender.clearFormatters();
+		// Do not crash if logger cannot be loaded
+		try {
+			this.appender = createRotatingLogger(name, file, 1024 * 1024 * 30, 1);
+			(<RotatingLogger>this.appender).clearFormatters();
+		} catch (error) {
+			console.error(error);
+			this.appender = {
+				critical() { },
+				flush() { },
+			};
+		}
 	}
 
 	append(content: string): void {
@@ -20,5 +35,4 @@ export class OutputAppender {
 	flush(): void {
 		this.appender.flush();
 	}
-
 }
\ No newline at end of file