diff --git a/pushnotifications/src/main/java/com/pusher/pushnotifications/api/PushNotificationsAPI.kt b/pushnotifications/src/main/java/com/pusher/pushnotifications/api/PushNotificationsAPI.kt
index f2cd0ce..2e1e978 100644
--- a/pushnotifications/src/main/java/com/pusher/pushnotifications/api/PushNotificationsAPI.kt
+++ b/pushnotifications/src/main/java/com/pusher/pushnotifications/api/PushNotificationsAPI.kt
@@ -146,6 +146,9 @@ class PushNotificationsAPI(private val instanceId: String, overrideHostURL: Stri
 
       val responseBody = response.body()
       if (responseBody != null && response.code() in 200..299) {
+        if (responseBody.initialInterestSet==null || responseBody.id==null){
+          throw PushNotificationsAPIException("device id or initial interests is null")
+        }
         return RegisterDeviceResult(
             deviceId = responseBody.id,
             initialInterests = responseBody.initialInterestSet)