diff --git a/kontor-scripts/db/models/comic.py b/kontor-scripts/db/models/comic.py
index a504028..72057d0 100644
--- a/kontor-scripts/db/models/comic.py
+++ b/kontor-scripts/db/models/comic.py
@@ -238,7 +238,10 @@ class Issue(Base, BaseMixin):
         self.version = import_data['version']
         self.issue_number = import_data['issue_number']
         self.title = import_data['title']
-        self.published_on = import_data['published_on']
+        if import_data['published_on'] == 'None':
+            self.published_on = None
+        else:
+            self.published_on = import_data['published_on']
         self.in_stock = import_data['in_stock']
         self.is_read = import_data['is_read']
         self.comic_id = import_data['comic_id']