diff --git a/hc/api/migrations/0038_auto_20180318_1216.py b/hc/api/migrations/0038_auto_20180318_1306.py
similarity index 80%
rename from hc/api/migrations/0038_auto_20180318_1216.py
rename to hc/api/migrations/0038_auto_20180318_1306.py
index bd1ca613..403c545f 100644
--- a/hc/api/migrations/0038_auto_20180318_1216.py
+++ b/hc/api/migrations/0038_auto_20180318_1306.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Generated by Django 1.11.6 on 2018-03-18 12:16
+# Generated by Django 1.11.6 on 2018-03-18 13:06
 from __future__ import unicode_literals
 
 from django.db import migrations, models
@@ -20,6 +20,6 @@ class Migration(migrations.Migration):
         migrations.AddField(
             model_name='ping',
             name='body',
-            field=models.CharField(blank=True, max_length=10000),
+            field=models.CharField(blank=True, max_length=10000, null=True),
         ),
     ]
diff --git a/hc/api/models.py b/hc/api/models.py
index 2d7fce3f..6ee99d6e 100644
--- a/hc/api/models.py
+++ b/hc/api/models.py
@@ -214,7 +214,7 @@ class Ping(models.Model):
     remote_addr = models.GenericIPAddressField(blank=True, null=True)
     method = models.CharField(max_length=10, blank=True)
     ua = models.CharField(max_length=200, blank=True)
-    body = models.CharField(max_length=10000, blank=True)
+    body = models.CharField(max_length=10000, blank=True, null=True)
 
 
 class Channel(models.Model):