Fix #16660

src/vs/workbench/parts/preferences/browser/preferencesService.ts

@@ -21,6 +21,7 @@ import { IEditorGroupService } from 'vs/workbench/services/group/common/groupSer
 import { IStorageService, StorageScope } from 'vs/platform/storage/common/storage';
 import { IFileService, IFileOperationResult, FileOperationResult } from 'vs/platform/files/common/files';
 import { IMessageService, Severity, IChoiceService } from 'vs/platform/message/common/message';
+import { IExtensionService } from 'vs/platform/extensions/common/extensions';
 import { IInstantiationService } from 'vs/platform/instantiation/common/instantiation';
 import { IEnvironmentService } from 'vs/platform/environment/common/environment';
 import { ICodeEditor } from 'vs/editor/browser/editorBrowser';
@@ -64,7 +65,8 @@ export class PreferencesService extends Disposable implements IPreferencesServic
 		@IEnvironmentService private environmentService: IEnvironmentService,
 		@ITelemetryService private telemetryService: ITelemetryService,
 		@ITextModelResolverService private textModelResolverService: ITextModelResolverService,
-		@IConfigurationEditingService private configurationEditingService: IConfigurationEditingService
+		@IConfigurationEditingService private configurationEditingService: IConfigurationEditingService,
+		@IExtensionService private extensionService: IExtensionService
 	) {
 		super();
 		this.defaultEditorModels = new Map<URI, IPreferencesEditorModel>();
@@ -77,8 +79,9 @@ export class PreferencesService extends Disposable implements IPreferencesServic
 		}
 
 		if (PreferencesService.DEFAULT_SETTINGS_URI.fsPath === uri.fsPath) {
-			return this.fetchMostCommonlyUsedSettings()
-				.then(mostCommonSettings => {
+			return TPromise.join<any>([this.extensionService.onReady(), this.fetchMostCommonlyUsedSettings()])
+				.then(result => {
+					const mostCommonSettings = result[1];
 					const model = this.instantiationService.createInstance(DefaultSettingsEditorModel, uri, mostCommonSettings);
 					this.defaultEditorModels.set(uri, model);
 					return model;