diff --git a/src/vs/test/utils/servicesTestUtils.ts b/src/vs/test/utils/servicesTestUtils.ts
index 688ff9a4f96b778eedb5b9b1851086096011acba..8ea86ac52476ecdb505d9762b461f3ba49e5a0b5 100644
--- a/src/vs/test/utils/servicesTestUtils.ts
+++ b/src/vs/test/utils/servicesTestUtils.ts
@@ -354,6 +354,7 @@ export class TestEditorGroupService implements IEditorGroupService {
 		services.set(IWorkspaceContextService, new TestContextService());
 		const lifecycle = new TestLifecycleService();
 		services.set(ILifecycleService, lifecycle);
+		services.set(ITelemetryService, NullTelemetryService);
 
 		let inst = new InstantiationService(services);
 
diff --git a/src/vs/workbench/common/editor/editorStacksModel.ts b/src/vs/workbench/common/editor/editorStacksModel.ts
index 91f6ff99986d27ad42481d88d188948eca0f9539..85f6722844915099c929f45d97992e527a99cc0d 100644
--- a/src/vs/workbench/common/editor/editorStacksModel.ts
+++ b/src/vs/workbench/common/editor/editorStacksModel.ts
@@ -1122,9 +1122,7 @@ export class EditorStacksModel implements IEditorStacksModel {
 	}
 
 	private handleOnEditorOpened(editor: EditorInput): void {
-		if (this.telemetryService) {
-			this.telemetryService.publicLog('editorOpened', editor.getTelemetryDescriptor());
-		}
+		this.telemetryService.publicLog('editorOpened', editor.getTelemetryDescriptor());
 	}
 
 	private handleOnEditorClosed(event: GroupEvent): void {
@@ -1144,9 +1142,7 @@ export class EditorStacksModel implements IEditorStacksModel {
 			}
 		}
 
-		if (this.telemetryService) {
-			this.telemetryService.publicLog('editorClosed', editor.getTelemetryDescriptor());
-		}
+		this.telemetryService.publicLog('editorClosed', editor.getTelemetryDescriptor());
 	}
 
 	public isOpen(resource: URI): boolean;
diff --git a/src/vs/workbench/test/browser/editorStacksModel.test.ts b/src/vs/workbench/test/browser/editorStacksModel.test.ts
index a55d91e090ca009c54e7e2c7e2eb1c92be9e653d..7e5a616daeb0730f721997278fbe5cf9e0ea0fce 100644
--- a/src/vs/workbench/test/browser/editorStacksModel.test.ts
+++ b/src/vs/workbench/test/browser/editorStacksModel.test.ts
@@ -19,6 +19,7 @@ import { IWorkspaceContextService } from 'vs/platform/workspace/common/workspace
 import { Registry } from 'vs/platform/platform';
 import { Position, Direction } from 'vs/platform/editor/common/editor';
 import { IInstantiationService } from 'vs/platform/instantiation/common/instantiation';
+import { ITelemetryService, NullTelemetryService } from 'vs/platform/telemetry/common/telemetry';
 import { DiffEditorInput } from 'vs/workbench/common/editor/diffEditorInput';
 import 'vs/workbench/browser/parts/editor/baseEditor';
 
@@ -27,6 +28,7 @@ function create(): EditorStacksModel {
 	inst.stub(IStorageService, new TestStorageService());
 	inst.stub(ILifecycleService, new TestLifecycleService());
 	inst.stub(IWorkspaceContextService, new TestContextService());
+	inst.stub(ITelemetryService, NullTelemetryService);
 
 	const config = new TestConfigurationService();
 	config.setUserConfiguration('workbench', { editor: { openPositioning: 'right' } });
@@ -641,6 +643,7 @@ suite('Editor Stacks Model', () => {
 		inst.stub(IStorageService, new TestStorageService());
 		inst.stub(ILifecycleService, new TestLifecycleService());
 		inst.stub(IWorkspaceContextService, new TestContextService());
+		inst.stub(ITelemetryService, NullTelemetryService);
 
 		const config = new TestConfigurationService();
 		inst.stub(IConfigurationService, config);
@@ -1175,6 +1178,8 @@ suite('Editor Stacks Model', () => {
 		inst.stub(IWorkspaceContextService, new TestContextService());
 		const lifecycle = new TestLifecycleService();
 		inst.stub(ILifecycleService, lifecycle);
+		inst.stub(ITelemetryService, NullTelemetryService);
+
 		const config = new TestConfigurationService();
 		config.setUserConfiguration('workbench', { editor: { openPositioning: 'right' } });
 		inst.stub(IConfigurationService, config);
@@ -1217,6 +1222,8 @@ suite('Editor Stacks Model', () => {
 		inst.stub(IWorkspaceContextService, new TestContextService());
 		const lifecycle = new TestLifecycleService();
 		inst.stub(ILifecycleService, lifecycle);
+		inst.stub(ITelemetryService, NullTelemetryService);
+
 		const config = new TestConfigurationService();
 		config.setUserConfiguration('workbench', { editor: { openPositioning: 'right' } });
 		inst.stub(IConfigurationService, config);
@@ -1298,6 +1305,8 @@ suite('Editor Stacks Model', () => {
 		inst.stub(IWorkspaceContextService, new TestContextService());
 		const lifecycle = new TestLifecycleService();
 		inst.stub(ILifecycleService, lifecycle);
+		inst.stub(ITelemetryService, NullTelemetryService);
+
 		const config = new TestConfigurationService();
 		config.setUserConfiguration('workbench', { editor: { openPositioning: 'right' } });
 		inst.stub(IConfigurationService, config);
@@ -1347,6 +1356,8 @@ suite('Editor Stacks Model', () => {
 		inst.stub(IWorkspaceContextService, new TestContextService());
 		const lifecycle = new TestLifecycleService();
 		inst.stub(ILifecycleService, lifecycle);
+		inst.stub(ITelemetryService, NullTelemetryService);
+
 		const config = new TestConfigurationService();
 		config.setUserConfiguration('workbench', { editor: { openPositioning: 'right' } });
 		inst.stub(IConfigurationService, config);
@@ -1387,6 +1398,8 @@ suite('Editor Stacks Model', () => {
 		inst.stub(IStorageService, new TestStorageService());
 		const lifecycle = new TestLifecycleService();
 		inst.stub(ILifecycleService, lifecycle);
+		inst.stub(ITelemetryService, NullTelemetryService);
+
 		const config = new TestConfigurationService();
 		config.setUserConfiguration('workbench', { editor: { openPositioning: 'right' } });
 		inst.stub(IConfigurationService, config);