diff --git a/lib/matrix_api/model/one_time_keys_claim_response.dart b/lib/matrix_api/model/one_time_keys_claim_response.dart
index 501fd48..7834211 100644
--- a/lib/matrix_api/model/one_time_keys_claim_response.dart
+++ b/lib/matrix_api/model/one_time_keys_claim_response.dart
@@ -21,7 +21,7 @@ class OneTimeKeysClaimResponse {
   Map<String, Map<String, dynamic>> oneTimeKeys;
 
   OneTimeKeysClaimResponse.fromJson(Map<String, dynamic> json) {
-    failures = Map<String, dynamic>.from(json['failures']);
+    failures = Map<String, dynamic>.from(json['failures'] ?? {});
     oneTimeKeys = Map<String, Map<String, dynamic>>.from(json['one_time_keys']);
   }