diff --git a/controller/Users.py b/controller/Users.py
index bfc12f6..fee5239 100644
--- a/controller/Users.py
+++ b/controller/Users.py
@@ -691,7 +691,7 @@ class Users( object ):
 
     # this feature requires a rate plan above basic
     user = self.__database.load( User, user_id )
-    if user is None or ( user.rate_plan == 0 and access != u"viewer" ):
+    if user is None or user.username is None or ( user.rate_plan == 0 and access != u"viewer" ):
       raise Access_error()
 
     if access == u"collaborator":
@@ -746,7 +746,7 @@ class Users( object ):
       message[ u"To" ] = email_address
       message[ u"Subject" ] = notebook_name
       message.set_payload(
-        u"I've shared a wiki with you called \"%s\"\n" % notebook_name +
+        u"I've shared a wiki with you called: %s\n" % notebook_name +
         u"Please visit the following link to view it online:\n\n" +
         u"%s/i/%s\n\n" % ( self.__https_url or self.__http_url, invite.object_id )
       )
diff --git a/controller/test/Test_users.py b/controller/test/Test_users.py
index 94374c5..4a72fc6 100644
--- a/controller/test/Test_users.py
+++ b/controller/test/Test_users.py
@@ -1109,6 +1109,29 @@ class Test_users( Test_controller ):
     
     assert result[ u"error" ]
 
+  def test_send_invites_without_username( self ):
+    Stub_smtp.reset()
+    smtplib.SMTP = Stub_smtp
+    self.login()
+
+    self.user._User__username = None
+    self.user.rate_plan = 1
+    self.database.save( self.user )
+
+    email_addresses_list = [ u"foo@example.com" ]
+    email_addresses = email_addresses_list[ 0 ]
+
+    result = self.http_post( "/users/send_invites", dict(
+      notebook_id = self.notebooks[ 0 ].object_id,
+      email_addresses = email_addresses,
+      access = u"viewer",
+      invite_button = u"send invites",
+    ), session_id = self.session_id )
+    session_id = result[ u"session_id" ]
+    
+    assert result[ u"error" ]
+    assert "access" in result[ u"error" ]
+
   def test_send_invites_without_any_access( self ):
     Stub_smtp.reset()
     smtplib.SMTP = Stub_smtp
diff --git a/view/Link_area.py b/view/Link_area.py
index 75f09ca..a77edfd 100644
--- a/view/Link_area.py
+++ b/view/Link_area.py
@@ -75,7 +75,7 @@ class Link_area( Div ):
             class_ = u"link_area_item",
           ),
 
-          ( notebook.owner ) and Div(
+          ( notebook.owner and user.username ) and Div(
             A(
               u"share",
               href = u"#",