fix error in model

billard/models.py

@@ -153,7 +153,7 @@ def process_location_data():
                 acc.save()
                 ld.delete()
             else:
-                if len(acc) > 0:
+                if len(ac) > 0:
                     acc = ac[0]
                     acc.time_to = ld.tst
                     acc.prize = utils.get_prize_for(