diff --git a/scheduler/__init__.py b/scheduler/__init__.py
index 1811c5a..e6b6e9e 100644
--- a/scheduler/__init__.py
+++ b/scheduler/__init__.py
@@ -1,3 +1,3 @@
-__version__ = '1.1.2'
+__version__ = '1.1.3'
 
 default_app_config = 'scheduler.apps.SchedulerConfig'
diff --git a/scheduler/models.py b/scheduler/models.py
index 40b5018..a0817a4 100644
--- a/scheduler/models.py
+++ b/scheduler/models.py
@@ -75,7 +75,7 @@ def clean_queue(self):
             })
 
     def is_scheduled(self):
-        return self.job_id in self.scheduler()
+        return self.job_id and self.job_id in self.scheduler()
     is_scheduled.short_description = _('is scheduled?')
     is_scheduled.boolean = True