diff --git a/seminar/migrations/0001_squashed_0067_auto_20190814_0805.py b/seminar/migrations/0001_squashed_0067_auto_20190814_0805.py
index f9a8b5eb..f819f047 100644
--- a/seminar/migrations/0001_squashed_0067_auto_20190814_0805.py
+++ b/seminar/migrations/0001_squashed_0067_auto_20190814_0805.py
@@ -1518,7 +1518,7 @@ class Migration(migrations.Migration):
             fields=[
                 ('id', models.AutoField(primary_key=True, serialize=False)),
                 ('body', models.DecimalField(decimal_places=1, max_digits=8, verbose_name='body')),
-                ('cislo_body', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='hodnoceni', to='seminar.Cislo', verbose_name='číslo pro body')),
+                ('cislo_body', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='hodnoceni', to='seminar.Cislo', verbose_name='číslo pro body', null=True)),
                 ('problem', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='seminar.Problem', verbose_name='problém')),
                 ('reseni', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='seminar.Reseni', verbose_name='řešení')),
             ],
@@ -2025,7 +2025,7 @@ class Migration(migrations.Migration):
         migrations.AlterField(
             model_name='hodnoceni',
             name='cislo_body',
-            field=models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, related_name='hodnoceni', to='seminar.Cislo', verbose_name='číslo pro body'),
+            field=models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, related_name='hodnoceni', to='seminar.Cislo', verbose_name='číslo pro body', null=True),
         ),
         migrations.AlterField(
             model_name='hodnoceni',
diff --git a/seminar/migrations/0049_auto_20190430_2354.py b/seminar/migrations/0049_auto_20190430_2354.py
index de2b1b0d..985b3531 100644
--- a/seminar/migrations/0049_auto_20190430_2354.py
+++ b/seminar/migrations/0049_auto_20190430_2354.py
@@ -453,7 +453,7 @@ class Migration(migrations.Migration):
         migrations.AddField(
             model_name='hodnoceni',
             name='cislo_body',
-            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='hodnoceni', to='seminar.Cislo', verbose_name='číslo pro body'),
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='hodnoceni', to='seminar.Cislo', verbose_name='číslo pro body', null=True),
         ),
         migrations.AddField(
             model_name='hodnoceni',
diff --git a/seminar/migrations/0064_auto_20190610_2358.py b/seminar/migrations/0064_auto_20190610_2358.py
index 344b132c..b72a08a0 100644
--- a/seminar/migrations/0064_auto_20190610_2358.py
+++ b/seminar/migrations/0064_auto_20190610_2358.py
@@ -27,7 +27,7 @@ class Migration(migrations.Migration):
         migrations.AlterField(
             model_name='hodnoceni',
             name='cislo_body',
-            field=models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, related_name='hodnoceni', to='seminar.Cislo', verbose_name='číslo pro body'),
+            field=models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, related_name='hodnoceni', to='seminar.Cislo', verbose_name='číslo pro body', null=True),
         ),
         migrations.AlterField(
             model_name='hodnoceni',