diff --git a/addons/report/models/report.py b/addons/report/models/report.py
index 96296d50218..723c098ccb2 100644
--- a/addons/report/models/report.py
+++ b/addons/report/models/report.py
@@ -238,7 +238,7 @@ class Report(osv.Model):
                 # qweb branding. As website editor is not yet splitted in a module independant from
                 # website, when we print a unique report we can use the id passed in argument to
                 # identify it.
-                if len(ids) == 1:
+                if ids and len(ids) == 1:
                     reportid = ids[0]
 
                 contenthtml.append(tuple([reportid, reportcontent]))