diff --git a/fet2020/tasks/migrations/0002_slug.py b/fet2020/tasks/migrations/0002_slug.py
index 9ff072e2..fb63ab22 100644
--- a/fet2020/tasks/migrations/0002_slug.py
+++ b/fet2020/tasks/migrations/0002_slug.py
@@ -31,12 +31,12 @@ class Migration(migrations.Migration):
         migrations.AddField(
             model_name='task',
             name='shortterm',
-            field=models.CharField(blank=True, max_length=25),
+            field=models.CharField(blank=True, max_length=25, null=True),
         ),
         migrations.AddField(
             model_name='task',
             name='slug',
-            field=models.SlugField(blank=True, max_length=25),
+            field=models.SlugField(blank=True, max_length=25, null=True),
         ),
         migrations.AddField(
             model_name='tasklist',
@@ -74,6 +74,16 @@ class Migration(migrations.Migration):
             constraint=models.UniqueConstraint(fields=('title', 'date', 'task'), name='unique_task_document'),
         ),
         migrations.RunPython(forwards_func),
+        migrations.AlterField(
+            model_name='task',
+            name='shortterm',
+            field=models.SlugField(blank=True, unique=True),
+        ),
+        migrations.AlterField(
+            model_name='task',
+            name='slug',
+            field=models.SlugField(blank=True, unique=True),
+        ),
         migrations.AlterField(
             model_name='tasklist',
             name='slug',