diff --git a/billard/models.py b/billard/models.py
index e99a635..e6c4d60 100644
--- a/billard/models.py
+++ b/billard/models.py
@@ -1,4 +1,5 @@
 import uuid
+import logging
 from django.db import models
 from django.contrib.auth.models import User
 from datetime import datetime, timezone
@@ -6,10 +7,11 @@ from billard import utils
 from django.contrib.auth.models import User
 from django.db.models.signals import post_save
 from django.dispatch import receiver
-from django.core.mail import mail_admins
 from celery import shared_task
 from .tasks import request_process_location_data
 
+log = logging.getLogger(__name__)
+
 
 class LocationData(models.Model):
     client_id = models.UUIDField(blank=False, null=False, verbose_name="Client-ID")
@@ -126,7 +128,7 @@ def process_location_data():
             ld.processed = True
             ld.error_msg = 'No client object found. Stopp processing! {}, {}'.format(ld.client_id, ld.desk_no)
             ld.save()
-            mail_admins(subject=ld.error_msg, message=ld.error_msg)
+            log.error(ld.error_msg)
         else:
             cli = cli[0]
             desk = cli.desks.filter(desk_no=ld.desk_no, enabled=True)
@@ -134,15 +136,14 @@ def process_location_data():
                 ld.processed = True
                 ld.error_msg = 'No desk object found. Stopp processing! {}, {}'.format(ld.client_id, ld.desk_no)
                 ld.save()
-                mail_admins(subject=ld.error_msg, message=ld.error_msg)
+                log.error(ld.error_msg)
             desk = desk[0]
             ac = desk.accounting_set.order_by('time_from').reverse()
             if ld.on_off:
                 acc = None
                 if ac.count() > 0 and ac[0].time_to is None:
-                    mail_admins(subject='Accounting passt nicht',
-                                message='Vorheriges Accounting nicht abgeschlossen: Desk_id {}, Accounting_id {}'
-                                .format(desk.id, ac[0].id))
+                    log.error('Vorheriges Accounting nicht abgeschlossen: Desk_id {}, Accounting_id {}'
+                              .format(desk.id, ac[0].id))
                     acc = ac[0]
                 if acc is None:
                     acc = Accounting(
@@ -152,15 +153,21 @@ def process_location_data():
                 acc.save()
                 ld.delete()
             else:
-                acc = ac[0]
-                acc.time_to = ld.tst
-                acc.prize = utils.get_prize_for(
-                    start=acc.time_from,
-                    end=ld.tst,
-                    pph=desk.prize,
-                    hh_start=cli.location.happy_hour_start,
-                    hh_end=cli.location.happy_hour_end,
-                    pphh=desk.prize_hh,
-                )
-                acc.save()
-                ld.delete()
+                if len(acc) > 0:
+                    acc = ac[0]
+                    acc.time_to = ld.tst
+                    acc.prize = utils.get_prize_for(
+                        start=acc.time_from,
+                        end=ld.tst,
+                        pph=desk.prize,
+                        hh_start=cli.location.happy_hour_start,
+                        hh_end=cli.location.happy_hour_end,
+                        pphh=desk.prize_hh,
+                    )
+                    acc.save()
+                    ld.delete()
+                else:
+                    ld.processed = True
+                    ld.error_msg = 'No existing accountings found. Stopp processing! {}, {}'.format(ld.client_id, ld.desk_no)
+                    ld.save()
+                    log.error(ld.error_msg)