From c69977b8591a29c8f9cfa0713d8452ef0f39a318 Mon Sep 17 00:00:00 2001
From: corymhall <43035978+corymhall@users.noreply.github.com>
Date: Mon, 8 Nov 2021 14:41:40 +0000
Subject: [PATCH] only add dependency if topic is of type Topic

---
 packages/@aws-cdk/aws-sns-subscriptions/lib/lambda.ts | 2 +-
 packages/@aws-cdk/aws-sns-subscriptions/lib/sqs.ts    | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/@aws-cdk/aws-sns-subscriptions/lib/lambda.ts b/packages/@aws-cdk/aws-sns-subscriptions/lib/lambda.ts
index 85af9f14569c5..58c7a2aceb16b 100644
--- a/packages/@aws-cdk/aws-sns-subscriptions/lib/lambda.ts
+++ b/packages/@aws-cdk/aws-sns-subscriptions/lib/lambda.ts
@@ -38,7 +38,7 @@ export class LambdaSubscription implements sns.ITopicSubscription {
 
     // if the topic and function are created in different stacks
     // then we need to make sure the topic is created first
-    if (topic.stack !== this.fn.stack) {
+    if (topic instanceof sns.Topic && topic.stack !== this.fn.stack) {
       this.fn.stack.addDependency(topic.stack);
     }
 
diff --git a/packages/@aws-cdk/aws-sns-subscriptions/lib/sqs.ts b/packages/@aws-cdk/aws-sns-subscriptions/lib/sqs.ts
index d4e4c7cb5cc28..8bbb77927381f 100644
--- a/packages/@aws-cdk/aws-sns-subscriptions/lib/sqs.ts
+++ b/packages/@aws-cdk/aws-sns-subscriptions/lib/sqs.ts
@@ -63,7 +63,7 @@ export class SqsSubscription implements sns.ITopicSubscription {
 
     // if the topic and queue are created in different stacks
     // then we need to make sure the topic is created first
-    if (topic.stack !== this.queue.stack) {
+    if (topic instanceof sns.Topic && topic.stack !== this.queue.stack) {
       this.queue.stack.addDependency(topic.stack);
     }