diff --git a/ProjectPlugins/LogosStorageClient/LogosStorageTypes.cs b/ProjectPlugins/LogosStorageClient/LogosStorageTypes.cs
index 800134bf..7e75feec 100644
--- a/ProjectPlugins/LogosStorageClient/LogosStorageTypes.cs
+++ b/ProjectPlugins/LogosStorageClient/LogosStorageTypes.cs
@@ -11,7 +11,7 @@ namespace LogosStorageClient
         public string Id { get; set; } = string.Empty;
         public string[] AnnounceAddresses { get; set; } = Array.Empty<string>();
         public string Libp2pPubKey { get; set; } = string.Empty;
-        public string MixPubKey { get; set; } = string.Empty;
+        public string? MixPubKey { get; set; }
         public DebugInfoVersion Version { get; set; } = new();
         public DebugInfoTable Table { get; set; } = new();
     }
diff --git a/ProjectPlugins/LogosStorageClient/openapi.yaml b/ProjectPlugins/LogosStorageClient/openapi.yaml
index 490b989d..c3bbdc6b 100644
--- a/ProjectPlugins/LogosStorageClient/openapi.yaml
+++ b/ProjectPlugins/LogosStorageClient/openapi.yaml
@@ -128,6 +128,7 @@ components:
           description: Hex-encoded libp2p public key of the node
         mixPubKey:
           type: string
+          nullable: true
           description: Hex-encoded mix public key (present only for nodes that support mix)
         table:
           $ref: "#/components/schemas/PeersTable"