diff --git a/Common/onelab.h b/Common/onelab.h
index 31f382cb151774a3cd33df5c0db2ff7ac5f08803..b674981c5b98da9240e9b1114498fb0890938f25 100644
--- a/Common/onelab.h
+++ b/Common/onelab.h
@@ -345,7 +345,7 @@ namespace onelab{
         T tmp(name);
         typename std::set<T*, parameterLessThan>::iterator it = ps.find(&tmp);
         if(it != ps.end()){
-          (*it)->addClient(client);
+          if(client.size()) (*it)->addClient(client);
           p.push_back(**it);
         }
       }