diff --git a/log/middleware.py b/log/middleware.py
index 7c942f6..92df8af 100644
--- a/log/middleware.py
+++ b/log/middleware.py
@@ -32,16 +32,17 @@ class TimeSpentMiddleware(object):
 
 					request.session['log_id'] = None
 
-				oppened_logs = Log.objects.filter(user = request.user, context__contains={'timestamp_end': '-1'})
+				if request.user.is_authenticated:
+					oppened_logs = Log.objects.filter(user = request.user, context__contains={'timestamp_end': '-1'})
 
-				for op_log in oppened_logs:
-					if type(op_log.context) == dict:
-						log_context = op_log.context
-					else:
-						log_context = json.loads(op_log.context)
+					for op_log in oppened_logs:
+						if type(op_log.context) == dict:
+							log_context = op_log.context
+						else:
+							log_context = json.loads(op_log.context)
 
-					log_context['timestamp_end'] = str(int(time.time()))
+						log_context['timestamp_end'] = str(int(time.time()))
 
-					op_log.context = log_context
+						op_log.context = log_context
 
-					op_log.save()
\ No newline at end of file
+						op_log.save()
\ No newline at end of file
--
libgit2 0.21.2