diff --git a/django_q/models.py b/django_q/models.py
index 59cefcc..a01c01a 100644
--- a/django_q/models.py
+++ b/django_q/models.py
@@ -14,8 +14,8 @@ class Task(models.Model):
     name = models.CharField(max_length=100, editable=False)
     func = models.CharField(max_length=256)
     hook = models.CharField(max_length=256, null=True)
-    args = PickledObjectField()
-    kwargs = PickledObjectField()
+    args = PickledObjectField(null=True)
+    kwargs = PickledObjectField(null=True)
     result = PickledObjectField(null=True)
     started = models.DateTimeField(editable=False)
     stopped = models.DateTimeField(editable=False)