diff --git a/diploma_thesis/environment/machine.py b/diploma_thesis/environment/machine.py
index 339b405..12d3348 100644
--- a/diploma_thesis/environment/machine.py
+++ b/diploma_thesis/environment/machine.py
@@ -326,9 +326,6 @@ def __select_job__(self):
         if self.state.is_empty:
             return None
 
-        if len(self.state.queue) == 1:
-            return self.state.queue[0]
-
         job = self.shop_floor.schedule(self)
 
         return job
diff --git a/diploma_thesis/environment/work_center.py b/diploma_thesis/environment/work_center.py
index 606ef2c..e63bebd 100644
--- a/diploma_thesis/environment/work_center.py
+++ b/diploma_thesis/environment/work_center.py
@@ -128,11 +128,6 @@ def __dispatch__(self):
             self.history.with_decision_time(self.environment.now)
 
             for job in self.state.queue:
-                if len(self.machines) == 1:
-                    machine = self.machines[0]
-                    machine.receive(job)
-                    continue
-
                 self.shop_floor.will_dispatch(job, self)
 
                 machine = self.shop_floor.route(work_center=self, job=job)
diff --git a/diploma_thesis/tape/queue/machine_queue.py b/diploma_thesis/tape/queue/machine_queue.py
index 183068b..084755e 100644
--- a/diploma_thesis/tape/queue/machine_queue.py
+++ b/diploma_thesis/tape/queue/machine_queue.py
@@ -36,18 +36,19 @@ def clear_all(self):
     @filter(lambda self, context, *args, **kwargs: context.shop_floor.id in self.queue)
     @filter(lambda self, _, __, record: isinstance(record.result, Job))
     def register(self, context: Context, machine: Machine, record: MachineModel.Record):
-        self.queue[context.shop_floor.id][machine.key][record.result.id] = TapeRecord(
-            record=Record(
-                state=record.state,
-                action=record.action,
-                next_state=None,
-                reward=None,
-                done=False,
-                batch_size=[]
-            ),
-            context=self.reward.record_job_action(record.result, machine, context.moment),
-            moment=context.moment
-        )
+        if record.result:
+            self.queue[context.shop_floor.id][machine.key][record.result.id] = TapeRecord(
+                record=Record(
+                    state=record.state,
+                    action=record.action,
+                    next_state=None,
+                    reward=None,
+                    done=False,
+                    batch_size=[]
+                ),
+                context=self.reward.record_job_action(record.result, machine, context.moment),
+                moment=context.moment
+            )
 
     @filter(lambda self, context, machine, job: job.id in self.queue[context.shop_floor.id][machine.key])
     def record_next_state(self, context: Context, machine: Machine, job: Job):