diff --git a/src/auditlog/models.py b/src/auditlog/models.py
index 323cf23..dbe82b1 100644
--- a/src/auditlog/models.py
+++ b/src/auditlog/models.py
@@ -32,7 +32,7 @@ class LogEntryManager(models.Manager):
 
             get_additional_data = getattr(instance, 'get_additional_data', None)
             if callable(get_additional_data):
-                kwargs.setdefault('additional_data', instance.get_additional_data())
+                kwargs.setdefault('additional_data', get_additional_data())
 
             # Delete log entries with the same pk as a newly created model. This should only be necessary when an pk is
             # used twice.
@@ -116,7 +116,7 @@ class LogEntry(models.Model):
     changes = models.TextField(blank=True, verbose_name=_("change message"))
     actor = models.ForeignKey(settings.AUTH_USER_MODEL, blank=True, null=True, on_delete=models.SET_NULL, related_name='+', verbose_name=_("actor"))
     timestamp = models.DateTimeField(auto_now_add=True, verbose_name=_("timestamp"))
-    additional_data = JSONField(blank=True, null=True)
+    additional_data = JSONField(blank=True, null=True, verbose_name=_("additional data"))
 
     objects = LogEntryManager()