adding diff counter for history in logreader

1 files changed, 1 insertions, 1 deletions

diff --git a/monitor/josef_monitor.py b/monitor/josef_monitor.py
index 75553cd..a05a898 100755
--- a/monitor/josef_monitor.py
+++ b/monitor/josef_monitor.py
@@ -402,7 +402,7 @@ def main(args):
 
                 log.save_state()                         # Create rollback point 
                 log.update_sth()
-                if old_sth["timestamp"] != log.sth["timestamp"]:
+                if old_sth and old_sth["timestamp"] != log.sth["timestamp"]:
                     log.verify_progress(old_sth)         # Does rollback on critical fail
                     log.verify_consistency(old_sth)      # Does rollback on critical fail
                     log.incremental_build()              # Does rollback on critical fail