diff --git a/packages/at_client/lib/src/response/at_notification.dart b/packages/at_client/lib/src/response/at_notification.dart
index 9e14df2d2..0e1948088 100644
--- a/packages/at_client/lib/src/response/at_notification.dart
+++ b/packages/at_client/lib/src/response/at_notification.dart
@@ -38,8 +38,8 @@ class AtNotification {
       metadata.sharedKeyEnc = json['metadata'][AtConstants.sharedKeyEncrypted];
       // AtContants.sharedWithPublicKeyHash will be sent by the server starting v3.0.52
       // Notifications received from Secondary server before 3.0.52 does not contain
-      // AtConstants.sharedWithPublicKeyHash. Therefore, check for null String.
-      if (json['metadata'][AtConstants.sharedWithPublicKeyHash] != "null") {
+      // AtConstants.sharedWithPublicKeyHash. Therefore, check for null.
+      if (json['metadata'][AtConstants.sharedWithPublicKeyHash] != null) {
         var publicKeyHash =
             jsonDecode(json['metadata'][AtConstants.sharedWithPublicKeyHash]);
         metadata.pubKeyHash =