From 9ad0705ec7afc3d4804c07839896d88ec920ec06 Mon Sep 17 00:00:00 2001
From: nubpro <chai1998@live.com>
Date: Tue, 11 Aug 2020 00:00:21 +0800
Subject: [PATCH] fix(@aws-amplify/pubsub): fix undefined observer (#6436)

---
 packages/pubsub/src/Providers/AWSAppSyncRealTimeProvider.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/pubsub/src/Providers/AWSAppSyncRealTimeProvider.ts b/packages/pubsub/src/Providers/AWSAppSyncRealTimeProvider.ts
index dbe610f12b2..d8e8095444a 100644
--- a/packages/pubsub/src/Providers/AWSAppSyncRealTimeProvider.ts
+++ b/packages/pubsub/src/Providers/AWSAppSyncRealTimeProvider.ts
@@ -511,7 +511,7 @@ export class AWSAppSyncRealTimeProvider extends AbstractPubSubProvider {
 	private _errorDisconnect(msg: string) {
 		logger.debug(`Disconnect error: ${msg}`);
 		this.subscriptionObserverMap.forEach(({ observer }) => {
-			if (!observer.closed) {
+			if (observer && !observer.closed) {
 				observer.error({
 					errors: [{ ...new GraphQLError(msg) }],
 				});