gistfile1.diff

diff --git a/mbslave-sync.py b/mbslave-sync.py
index 7b1fdfa..2c44285 100755
--- a/mbslave-sync.py
+++ b/mbslave-sync.py
@@ -172,6 +172,7 @@ status = StatusReport(schema_seq, replication_seq)
 if config.monitoring.enabled:
     status.load(config.monitoring.status_file)
 
+num_packets = 0
 while True:
     replication_seq += 1
     hook = hook_class(config, db, config)
@@ -183,7 +184,11 @@ while True:
     process_tar(tmp, db, config, ignored_tables, schema_seq, replication_seq, hook)
     tmp.close()
     status.update(replication_seq)
+    num_packets += 1
 
 if config.monitoring.enabled:
     status.save(config.monitoring.status_file)
 
+if not num_packets:
+    sys.exit(1)
+