diff --git a/src/in-house-bot/deployment.ts b/src/in-house-bot/deployment.ts
index 418e5256f..b717a5420 100644
--- a/src/in-house-bot/deployment.ts
+++ b/src/in-house-bot/deployment.ts
@@ -308,6 +308,8 @@ export class Deployment {
   }
 
   public getChildDeploymentWithProps = async (props={}): Promise<IDeploymentConf> => {
+    assertNoNullProps(props, `invalid filter props: ${JSON.stringify(props)}`)
+
     return this.getChildDeployment({
       filter: {
         EQ: props
@@ -1160,3 +1162,11 @@ const getTmpSNSTopicName = ({ id, type }: {
 const genSID = (base: string) => `${base}${randomStringWithLength(10)}`
 
 const getTmpTopicExpirationDate = () => Date.now() + TMP_SNS_TOPIC_TTL
+
+const assertNoNullProps = (obj: any, msg: string) => {
+  for (let p in obj) {
+    if (obj[p] == null) {
+      throw new Errors.InvalidInput(msg)
+    }
+  }
+}
diff --git a/src/utils.ts b/src/utils.ts
index 64c5e2ee6..fb9fc523f 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -1479,12 +1479,18 @@ export const parseStackStatusEvent = (event: any): StackStatus => {
     return map
   }, {})
 
+  const { StackId, Timestamp, ResourceStatus, ResourceType } = props
+  const subscriptionArn = event.Records[0].EventSubscriptionArn
+  if (!(StackId && Timestamp && ResourceStatus && ResourceType && subscriptionArn)) {
+    throw new Errors.InvalidInput('invalid stack status event')
+  }
+
   return {
-    stackId: props.StackId,
-    timestamp: new Date(props.Timestamp).getTime(),
-    status: props.ResourceStatus,
-    resourceType: props.ResourceType,
-    subscriptionArn: event.Records[0].EventSubscriptionArn,
+    stackId: StackId,
+    timestamp: new Date(Timestamp).getTime(),
+    status: ResourceStatus,
+    resourceType: ResourceType,
+    subscriptionArn,
   }
 }