diff --git a/src/sofa/pbrpc/rpc_endpoint.cc b/src/sofa/pbrpc/rpc_endpoint.cc
index 96c3792..6bc4965 100644
--- a/src/sofa/pbrpc/rpc_endpoint.cc
+++ b/src/sofa/pbrpc/rpc_endpoint.cc
@@ -32,6 +32,7 @@ bool ResolveAddress(IOService& io_service,
         const std::string& host, const std::string& svc,
         RpcEndpoint* endpoint)
 {
+    if (!endpoint) return false;
     tcp::resolver resolver(io_service);
     boost::system::error_code ec;
     tcp::resolver::iterator it = resolver.resolve(tcp::resolver::query(host, svc), ec), end;
@@ -57,6 +58,7 @@ bool ResolveAddress(IOService& io_service,
         const std::string& address,
         RpcEndpoint* endpoint)
 {
+    if (!endpoint) return false;
     std::string::size_type pos = address.find(':');
     if (pos == std::string::npos)
     {