diff --git a/src/cutecoin/core/person.py b/src/cutecoin/core/person.py
index bd3c0790fd65a3b40798f26e59543dc1d7c7f717..c907d3df6bc7c9f955575b081fb3fc061321f771 100644
--- a/src/cutecoin/core/person.py
+++ b/src/cutecoin/core/person.py
@@ -186,11 +186,11 @@ class Person(object):
         for result in data['results']:
             if result["pubkey"] == self.pubkey:
                 uids = result['uids']
-                for uid in uids:
-                    if uid["meta"]["timestamp"] > timestamp:
-                        timestamp = uid["meta"]["timestamp"]
-                        uid = uid["uid"]
-                        signature = uid["self"]
+                for uid_data in uids:
+                    if uid_data["meta"]["timestamp"] > timestamp:
+                        timestamp = uid_data["meta"]["timestamp"]
+                        uid = uid_data["uid"]
+                        signature = uid_data["self"]
 
                 return SelfCertification(PROTOCOL_VERSION,
                                              community.currency,
diff --git a/src/cutecoin/gui/certification.py b/src/cutecoin/gui/certification.py
index 44244501267f4950dc716f6f86ee8deda3dd6bea..2ec0b190ac0e5da02d94fbdcb7d332bb3ba7ccb3 100644
--- a/src/cutecoin/gui/certification.py
+++ b/src/cutecoin/gui/certification.py
@@ -33,7 +33,7 @@ class CertificationDialog(QDialog, Ui_CertificationDialog):
     def accept(self):
         if self.radio_contact.isChecked():
             index = self.combo_contact.currentIndex()
-            pubkey = self.account.contacts[index].pubkey
+            pubkey = self.account.contacts[index]['pubkey']
         else:
             pubkey = self.edit_pubkey.text()