diff --git a/src/vs/workbench/api/node/extHostExtensionService.ts b/src/vs/workbench/api/node/extHostExtensionService.ts
index 3b8e97d6165..814e52aae4b 100644
--- a/src/vs/workbench/api/node/extHostExtensionService.ts
+++ b/src/vs/workbench/api/node/extHostExtensionService.ts
@@ -303,6 +303,14 @@ export class ExtHostExtensionService extends AbstractExtensionService<ExtHostExt
 				this._loadExtensionContext(extensionDescription)
 			]).then(values => {
 				return ExtHostExtensionService._callActivate(<IExtensionModule>values[0], <IExtensionContext>values[1]);
+			}, (errors: any[]) => {
+				// Avoid failing with an array of errors, fail with a single error
+				if (errors[0]) {
+					return TPromise.wrapError(errors[0]);
+				}
+				if (errors[1]) {
+					return TPromise.wrapError(errors[1]);
+				}
 			});
 		});
 	}