diff --git a/app/models/plugin_datum.py b/app/models/plugin_datum.py
index d99b1a630..2fb67ab09 100644
--- a/app/models/plugin_datum.py
+++ b/app/models/plugin_datum.py
@@ -5,7 +5,7 @@
 
 class PluginDatum(models.Model):
     key = models.CharField(max_length=255, help_text=_("Setting key"), db_index=True, verbose_name=_("Key"))
-    user = models.ForeignKey(settings.AUTH_USER_MODEL, null=True, default=None, on_delete=models.CASCADE, help_text=_("The user this setting belongs to. If NULL, the setting is global."), verbose_name=_("User"))
+    user = models.ForeignKey(settings.AUTH_USER_MODEL, null=True, blank=True, default=None, on_delete=models.CASCADE, help_text=_("The user this setting belongs to. If NULL, the setting is global."), verbose_name=_("User"))
     int_value = models.IntegerField(blank=True, null=True, default=None, verbose_name=_("Integer value"))
     float_value = models.FloatField(blank=True, null=True, default=None, verbose_name=_("Float value"))
     bool_value = models.NullBooleanField(blank=True, null=True, default=None, verbose_name=_("Bool value"))