diff --git a/protocol/Protocol.py b/protocol/Protocol.py
index 776cd5e0..9745e19b 100755
--- a/protocol/Protocol.py
+++ b/protocol/Protocol.py
@@ -977,7 +977,7 @@ def in_LOGIN(self, client, username, password, cpu='0', local_ip='', sentence_ar
 				last_mac_id, last_sys_id = last_id.split(" ") 
 			else:
 				last_mac_id = last_id # backwards compat for SL<0.269
-				last_sys_id = None
+				last_sys_id = "0"
 			for flag in compat_flags.split(' '):
 				client.compat.add(flag)