diff --git a/lib/ucoinpy/documents/block.py b/lib/ucoinpy/documents/block.py
index 873f404d09bc74de170d779aa1145ac6968863f1..6a023cd6f383908cb087ea57a2abf593e97ea10a 100644
--- a/lib/ucoinpy/documents/block.py
+++ b/lib/ucoinpy/documents/block.py
@@ -73,6 +73,7 @@ BOTTOM_SIGNATURE
     re_actives = re.compile("Actives:\n")
     re_leavers = re.compile("Leavers:\n")
     re_excluded = re.compile("Excluded:\n")
+    re_exclusion = re.compile("([1-9A-Za-z][^OIl]{42,45})\n")
     re_certifications = re.compile("Certifications:\n")
     re_transactions = re.compile("Transactions:\n")
 
@@ -197,7 +198,7 @@ BOTTOM_SIGNATURE
         if Block.re_excluded.match(lines[n]):
             n = n + 1
             while Block.re_certifications.match(lines[n]) is None:
-                membership = Membership.from_inline(version, currency, "OUT", lines[n])
+                membership = Block.re_exclusion.match(lines[n]).group(1)
                 excluded.append(membership)
                 n = n + 1
 
@@ -282,7 +283,7 @@ PreviousIssuer: {1}\n".format(self.prev_hash, self.prev_issuer)
 
         doc += "Excluded:\n"
         for exclude in self.excluded:
-            doc += "{0}\n".format(exclude.inline())
+            doc += "{0}\n".format(exclude)
 
         doc += "Certifications:\n"
         for cert in self.certifications:
diff --git a/src/cutecoin/core/person.py b/src/cutecoin/core/person.py
index 0ebc8fc58ae5ec0c714d1c186427ea34fceaa42f..60b24176947bdb280c3be3dd0243decf0e8d8954 100644
--- a/src/cutecoin/core/person.py
+++ b/src/cutecoin/core/person.py
@@ -32,6 +32,7 @@ class Person(object):
         '''
         data = community.request(bma.wot.Lookup, req_args={'search': pubkey})
         results = data['results']
+        logging.debug(results)
         timestamp = 0
 
         for result in data['results']:
diff --git a/src/cutecoin/gui/community_tab.py b/src/cutecoin/gui/community_tab.py
index 4165abd337ffc6f4951eb203e21c5e228ebc2d02..c7c7938786d727fc1ed6f66c11f60ee50cd4eafb 100644
--- a/src/cutecoin/gui/community_tab.py
+++ b/src/cutecoin/gui/community_tab.py
@@ -14,6 +14,7 @@ from .add_contact import AddContactDialog
 from .wot_tab import WotTabWidget
 from .transfer import TransferMoneyDialog
 from .certification import CertificationDialog
+from ..tools.exceptions import PersonNotFoundError
 
 
 class CommunityTabWidget(QWidget, Ui_CommunityTabWidget):
@@ -32,6 +33,7 @@ class CommunityTabWidget(QWidget, Ui_CommunityTabWidget):
         self.account = account
         self.password_asker = password_asker
         self.list_community_members.setModel(MembersListModel(community))
+        self.button_membership.disconnect()
 
         if self.account.member_of(self.community):
             self.button_membership.setText("Send leaving demand")
@@ -111,6 +113,10 @@ class CommunityTabWidget(QWidget, Ui_CommunityTabWidget):
         except ValueError as e:
             QMessageBox.critical(self, "Join demand error",
                               e.message)
+        except PersonNotFoundError as e:
+            QMessageBox.critical(self, "Key not sent to community",
+                              "Your key wasn't sent in the community. \
+                              You can't request a membership.")
 
     def send_membership_leaving(self):
         password = ""