diff --git a/addons/base_calendar/base_calendar.py b/addons/base_calendar/base_calendar.py
index a1e4293eaf9..93c92acf342 100644
--- a/addons/base_calendar/base_calendar.py
+++ b/addons/base_calendar/base_calendar.py
@@ -1532,6 +1532,8 @@ e.g.: Every other month on the last Sunday of the month for 10 occurrences:\
         for base_calendar_id, real_id in select:
             #REVET: Revision ID: olt@tinyerp.com-20100924131709-cqsd1ut234ni6txn
             res = super(calendar_event, self).read(cr, uid, real_id, fields=fields, context=context, load=load)
+            if not res :
+                res = {}
             ls = base_calendar_id2real_id(base_calendar_id, with_date=res and res.get('duration', 0) or 0)
             if not isinstance(ls, (str, int, long)) and len(ls) >= 2:
                 res['date'] = ls[1]