The QuerySet ms doesn't have the method pop(), so we just access the …

…first item directly with the 0 index

hado/models.py

@@ -66,7 +66,7 @@ def member_since(self):
 			if not hasattr(self, '__member_since'):
 				ms = self.contracts.filter(ctype__desc='Membership').order_by('start')[0:1]
 				if len(ms) > 0:
-					self.__member_since = ms.pop().start
+					self.__member_since = ms[0].start
 				else:
 					self.__member_since = None