diff --git a/ietf/meeting/views.py b/ietf/meeting/views.py
index 99d59c36f..53d81757f 100644
--- a/ietf/meeting/views.py
+++ b/ietf/meeting/views.py
@@ -1150,7 +1150,8 @@ def upload_session_bluesheets(request, session_id, num):
                 bluesheet_sp.rev = doc.rev
                 bluesheet_sp.save()
             else:
-                sess_time = session.official_timeslotassignment().timeslot.time
+                ota = session.official_timeslotassignment()
+                sess_time = ota and ota.timeslot.time
                 if session.meeting.type_id=='ietf':
                     name = 'bluesheets-%s-%s-%s' % (session.meeting.number, 
                                                     session.group.acronym, 
@@ -1238,7 +1239,8 @@ def upload_session_minutes(request, session_id, num):
                 minutes_sp.rev = doc.rev
                 minutes_sp.save()
             else:
-                sess_time = session.official_timeslotassignment().timeslot.time
+                ota = session.official_timeslotassignment()
+                sess_time = ota and ota.timeslot.time
                 if session.meeting.type_id=='ietf':
                     name = 'minutes-%s-%s' % (session.meeting.number, 
                                                  session.group.acronym) 
@@ -1332,8 +1334,8 @@ def upload_session_agenda(request, session_id, num):
                 doc = agenda_sp.document
                 created = False
             else:
-                
-                sess_time = session.official_timeslotassignment() and session.official_timeslotassignment().timeslot.time
+                ota = session.official_timeslotassignment()
+                sess_time = ota and ota.timeslot.time
                 if session.meeting.type_id=='ietf':
                     name = 'agenda-%s-%s' % (session.meeting.number, 
                                                  session.group.acronym)