diff --git a/repertory/librepertory/include/types/repertory.hpp b/repertory/librepertory/include/types/repertory.hpp
index 6288e6fc..1821e013 100644
--- a/repertory/librepertory/include/types/repertory.hpp
+++ b/repertory/librepertory/include/types/repertory.hpp
@@ -478,7 +478,11 @@ template <> struct adl_serializer<repertory::encrypt_config> {
     data.at(repertory::JSON_ENCRYPTION_TOKEN).get_to(value.encryption_token);
     data.at(repertory::JSON_PATH).get_to(value.path);
 
-    auto kdf_str = data[repertory::JSON_KDF_CONFIG].get<std::string>();
+    if (not data.contains(repertory::JSON_KDF_CONFIG)) {
+      return;
+    }
+
+    auto kdf_str = data.at(repertory::JSON_KDF_CONFIG).get<std::string>();
     if (kdf_str.empty()) {
       return;
     }