diff --git a/django_toosimple_q/admin.py b/django_toosimple_q/admin.py
index ec8dca6..435e3bd 100644
--- a/django_toosimple_q/admin.py
+++ b/django_toosimple_q/admin.py
@@ -188,6 +188,10 @@ def last_due_(self, obj):
 
     @admin.display()
     def next_due_(self, obj):
+        # for schedule not in the code anymore
+        if not obj.schedule:
+            return "invalid"
+
         if len(obj.past_dues) >= 1:
             next_due = obj.past_dues[0]
         else:
diff --git a/django_toosimple_q/management/commands/worker.py b/django_toosimple_q/management/commands/worker.py
index 740e27b..c9ec60c 100644
--- a/django_toosimple_q/management/commands/worker.py
+++ b/django_toosimple_q/management/commands/worker.py
@@ -2,6 +2,7 @@
 import logging
 import os
 import signal
+from time import sleep
 from traceback import format_exc
 
 from django.core.management.base import BaseCommand, CommandError
@@ -65,10 +66,10 @@ def add_arguments(self, parser):
     def handle(self, *args, **options):
         # Handle interuption signals
         signal.signal(signal.SIGINT, self.handle_signal)
-        # signal.signal(signal.SIGTERM, self.handle_signal)
-        signal.signal(signal.SIGTERM, signal.default_int_handler)
-        # for simulating an exception in tests
+        signal.signal(signal.SIGTERM, self.handle_signal)
+        # Custom signal to provoke an artifical exception, used for testing only
         if hasattr(signal, "SIGUSR1"):
+            # this doesn't exist on Windows
             signal.signal(signal.SIGUSR1, self.handle_signal)
 
         # TODO: replace by simple-parsing
@@ -243,7 +244,7 @@ def do_loop(self) -> bool:
             logger.debug(f"Waiting for next tick...")
             next_run = last_run + datetime.timedelta(seconds=self.tick_duration)
             while not self.exit_requested and now() < next_run:
-                pass
+                sleep(1)
 
         return True
 
diff --git a/django_toosimple_q/models.py b/django_toosimple_q/models.py
index d1c15d7..293a7e2 100644
--- a/django_toosimple_q/models.py
+++ b/django_toosimple_q/models.py
@@ -204,6 +204,10 @@ def icon(self):
 
     @cached_property
     def past_dues(self):
+        if self.schedule is None:
+            # Deal with invalid schedule (e.g. deleted from the code but still in the DB)
+            return []
+
         if self.schedule.cron == "manual":
             # A manual schedule is never due
             return []
diff --git a/django_toosimple_q/schedule.py b/django_toosimple_q/schedule.py
index a246cbd..789b4fc 100644
--- a/django_toosimple_q/schedule.py
+++ b/django_toosimple_q/schedule.py
@@ -2,7 +2,6 @@
 from typing import Dict, List, Optional
 
 from .logging import logger
-from .registry import tasks_registry
 from .task import Task
 
 
@@ -42,9 +41,7 @@ def execute(self, dues: List[Optional[datetime]]):
             if self.datetime_kwarg:
                 dt_kwarg = {self.datetime_kwarg: due}
 
-            tasks_registry[self.name].enqueue(
-                *self.args, due=due, **dt_kwarg, **self.kwargs
-            )
+            self.task.enqueue(*self.args, due=due, **dt_kwarg, **self.kwargs)
 
     def __str__(self):
         return f"Schedule {self.name}"
diff --git a/django_toosimple_q/tests/tests_regression.py b/django_toosimple_q/tests/tests_regression.py
index cb51aee..998b440 100644
--- a/django_toosimple_q/tests/tests_regression.py
+++ b/django_toosimple_q/tests/tests_regression.py
@@ -1,11 +1,15 @@
 import time
 
+from django.core import management
+
+from django_toosimple_q.decorators import register_task, schedule_task
 from django_toosimple_q.models import TaskExec
+from django_toosimple_q.registry import schedules_registry, tasks_registry
 
-from .base import TooSimpleQBackgroundTestCase
+from .base import TooSimpleQBackgroundTestCase, TooSimpleQRegularTestCase
 
 
-class TestRegression(TooSimpleQBackgroundTestCase):
+class TestRegressionBackground(TooSimpleQBackgroundTestCase):
     def test_regr_schedule_short(self):
         # Regression test for an issue where a schedule with smaller periods was not always processed
 
@@ -17,3 +21,32 @@ def test_regr_schedule_short(self):
 
         # It should do almost 20 tasks
         self.assertGreaterEqual(TaskExec.objects.all().count(), 18)
+
+
+class TestRegressionRegular(TooSimpleQRegularTestCase):
+    def test_deleting_schedule(self):
+        # Regression test for an issue where deleting a schedule in code would crash the admin view
+
+        @schedule_task(cron="0 12 * * *", datetime_kwarg="scheduled_on")
+        @register_task(name="normal")
+        def a(scheduled_on):
+            return f"{scheduled_on:%Y-%m-%d %H:%M}"
+
+        management.call_command("worker", "--until_done")
+
+        schedules_registry.clear()
+        tasks_registry.clear()
+
+        # the admin view still works even for deleted schedules
+        response = self.client.get("/admin/toosimpleq/scheduleexec/")
+        self.assertEqual(response.status_code, 200)
+
+    def test_different_schedule_and_task(self):
+        # Regression test for an issue where schedule with a different name than the task would fail
+
+        @schedule_task(cron="0 12 * * *", name="name_a", run_on_creation=True)
+        @register_task(name="name_b")
+        def a():
+            return True
+
+        management.call_command("worker", "--until_done")