diff --git a/netbox_config_backup/__init__.py b/netbox_config_backup/__init__.py
index a5cad9b..27191af 100644
--- a/netbox_config_backup/__init__.py
+++ b/netbox_config_backup/__init__.py
@@ -38,7 +38,7 @@ class NetboxConfigBackup(PluginConfig):
     def ready(self, *args, **kwargs):
         super().ready()
         import sys
-        if 'rqworker' in sys.argv[1]:
+        if len(sys.argv) > 1 and 'rqworker' in sys.argv[1]:
             from netbox import settings
             from netbox_config_backup.jobs.backup import BackupRunner
             frequency = settings.PLUGINS_CONFIG.get('netbox_config_backup', {}).get('frequency') / 60
diff --git a/netbox_config_backup/migrations/0019_alter_backup_device.py b/netbox_config_backup/migrations/0019_alter_backup_device.py
new file mode 100644
index 0000000..0ab3a3f
--- /dev/null
+++ b/netbox_config_backup/migrations/0019_alter_backup_device.py
@@ -0,0 +1,26 @@
+# Generated by Django 5.0.9 on 2024-11-18 23:14
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('dcim', '0191_module_bay_rebuild'),
+        ('netbox_config_backup', '0018_move_to_nbmodel'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='backup',
+            name='device',
+            field=models.ForeignKey(
+                blank=True,
+                null=True,
+                on_delete=django.db.models.deletion.SET_NULL,
+                related_name='backups',
+                to='dcim.device',
+            ),
+        ),
+    ]