diff --git a/tryton/rpc.py b/tryton/rpc.py
index fe1d8b4fbc..de99b5207f 100644
--- a/tryton/rpc.py
+++ b/tryton/rpc.py
@@ -58,7 +58,7 @@ def server_version(host, port):
         logging.getLogger(__name__).debug(repr(result))
         return result
     except (Fault, socket.error):
-        raise
+        return None
 
 
 def login(host, port, database, username, parameters, language=None):