diff --git a/billard/tasks.py b/billard/tasks.py
index 0e81fef..092686d 100644
--- a/billard/tasks.py
+++ b/billard/tasks.py
@@ -9,23 +9,34 @@ from . import utils
 def process_location_data():
     data = models.LocationData.objects.filter(processed=False)
     for ld in data:
-        cli = models.Client.objects.get(uuid=ld.location_id)
-        ac = models.Accounting.objects.filter(client=cli).order_by('time_from').reverse()[0]
-        if ld.on_off:
-            if ac.time_to is None:
-                ac.time_to = datetime.now()
-                ac.save()
-            ac = models.Accounting(
-                client=cli,
-                desk_no=ld.table_no,
-                time_from=ld.tst,
-            )
-            ac.save()
-            ld.processed=True
+        cli = models.Client.objects.filter(uuid=ld.location_id)
+        if cli.count() < 1:
+            ld.processed = True
+            ld.error_msg = 'No location object found. Stopp processing!'
             ld.save()
+            # TODO Send error eMail to Admin
         else:
-            ac.time_to = ld.tst
-            ac.prize = utils.get_prize_for(start=ac.time_from, end=ac.time_to, pph=cli.desk1_prize_ht)
-            ac.save()
-            ld.processed=True
-            ld.save()
+            cli = cli[0]
+            ac = models.Accounting.objects.filter(client=cli).order_by('time_from').reverse()
+            if ld.on_off:
+                if ac.count() > 0 and ac[0].time_to is None:
+                    ac[0].time_to = datetime.now()
+                    ac[0].save()
+                    # TODO Send error eMail to Admin
+                acc = models.Accounting(
+                    client=cli,
+                    desk_no=ld.table_no,
+                    time_from=ld.tst,
+                )
+                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=cli.desk1_prize_ht
+                )
+                acc.save()
+                ld.delete()
diff --git a/billard/utils.py b/billard/utils.py
index 78cb835..4251112 100644
--- a/billard/utils.py
+++ b/billard/utils.py
@@ -1,7 +1,7 @@
 from datetime import datetime, date, time
 
 
-def get_prize_for(start, end=datetime.now(), pph=0):
+def get_prize_for(start, end, pph=0):
     """
     calculate prize of billard table rental