diff --git a/abonapp/views.py b/abonapp/views.py
index ebc4785..0a87d0a 100644
--- a/abonapp/views.py
+++ b/abonapp/views.py
@@ -763,6 +763,7 @@ def save_user_dev_port(request, gid, uname):
         return redirect('abonapp:abon_home', gid, uname)
     user_port = mydefs.safe_int(request.POST.get('user_port'))
     is_dynamic_ip = request.POST.get('is_dynamic_ip')
+    is_dynamic_ip = True if is_dynamic_ip == 'on' else False
     try:
         abon = models.Abon.objects.get(username=uname)
         if user_port == 0:
@@ -788,10 +789,7 @@ def save_user_dev_port(request, gid, uname):
 
         abon.dev_port = port
         if abon.is_dynamic_ip != is_dynamic_ip:
-            if is_dynamic_ip == 'on':
-                abon.is_dynamic_ip = True
-            else:
-                abon.is_dynamic_ip = False
+            abon.is_dynamic_ip = is_dynamic_ip
             abon.save(update_fields=['dev_port', 'is_dynamic_ip'])
         else:
             abon.save(update_fields=['dev_port'])
diff --git a/cron.py b/cron.py
index 70446bf..13879a8 100755
--- a/cron.py
+++ b/cron.py
@@ -1,6 +1,7 @@
 #!/usr/bin/env python3
 import os
 import django
+
 os.environ.setdefault("DJANGO_SETTINGS_MODULE", "djing.settings")
 django.setup()
 from django.utils import timezone
@@ -13,7 +14,7 @@ from mydefs import LogicError
 
 def main():
     signals.pre_delete.disconnect(abontariff_pre_delete, sender=AbonTariff)
-    # AbonTariff.objects.filter(abon=None).delete()
+    AbonTariff.objects.filter(abon=None).delete()
     now = timezone.now()
     fields = ('id', 'tariff__title', 'abon__id')
     expired_services = AbonTariff.objects.filter(deadline__lt=now).exclude(abon=None)
@@ -37,7 +38,7 @@ def main():
     # sync subscribers on NAS
     try:
         tm = Transmitter()
-        users = Abon.objects.filter(is_dynamic_ip=False, is_active=True).exclude(current_tariff=None)
+        users = Abon.objects.filter(is_active=True).exclude(current_tariff=None)
         tm.sync_nas(users)
     except NasNetworkError as e:
         print('NetworkTrouble:', e)
diff --git a/devapp/views.py b/devapp/views.py
index 21595ac..f56ad9c 100644
--- a/devapp/views.py
+++ b/devapp/views.py
@@ -366,7 +366,7 @@ def devview(request, device_id):
             if dev.man_passw:
                 manager = dev.get_manager_object()
                 ports = manager.get_ports()
-                if isinstance(ports[0], Exception):
+                if len(ports) > 0 and isinstance(ports[0], Exception):
                     messages.error(request, ports[0])
                     ports = ports[1]
                 template_name = manager.get_template_name()