FIXBUG: is_dhcp есть метод и свойство, надо различать

abonapp/models.py

@@ -436,8 +436,13 @@ class AbonRawPassword(models.Model):
 
 def abon_post_save(sender, instance, **kwargs):
     timeout = None
-    if hasattr(instance, 'is_dhcp') and instance.is_dhcp():
-        timeout = getattr(settings, 'DHCP_TIMEOUT', 14400)
+    if hasattr(instance, 'is_dhcp'):
+        if callable(instance.is_dhcp):
+            if instance.is_dhcp():
+                timeout = getattr(settings, 'DHCP_TIMEOUT', 14400)
+        else:
+            if instance.is_dhcp:
+                timeout = getattr(settings, 'DHCP_TIMEOUT', 14400)
     agent_abon = instance.build_agent_struct()
     if agent_abon is None:
         return True