diff --git a/mempalace/mcp_server.py b/mempalace/mcp_server.py
index ca71f60..71a96df 100644
--- a/mempalace/mcp_server.py
+++ b/mempalace/mcp_server.py
@@ -1968,6 +1968,8 @@ SUPPORTED_PROTOCOL_VERSIONS = [
 
 
 def handle_request(request):
+    if not isinstance(request, dict):
+        return {"jsonrpc": "2.0", "error": {"code": -32600, "message": "Invalid Request"}}
     method = request.get("method") or ""
     params = request.get("params") or {}
     req_id = request.get("id")