diff --git a/UserAd_class.py b/UserAd_class.py
index 9457f61..a7f3ff8 100644
--- a/UserAd_class.py
+++ b/UserAd_class.py
@@ -35,7 +35,7 @@ class UserAd:
         expression = "(&(objectCategory=person)(objectClass=user)(sAMAccountName=%s))" % self.usrName
         res = self.sam.search(base=base, expression=expression, attrs=['memberOf'])
         groups = []
-        if len(res[0]) == 0:
+        if len(res) == 0 or len(res[0]) == 0:
             return groups
         for k in res[0]['memberOf']:
             groups.append(str(k).split(',')[0].split('=')[1])