diff --git a/com/templates/com/screen_slideshow.jinja b/com/templates/com/screen_slideshow.jinja
index 448f8dfc..0374257e 100644
--- a/com/templates/com/screen_slideshow.jinja
+++ b/com/templates/com/screen_slideshow.jinja
@@ -3,7 +3,7 @@
   <head>
     <title>{% trans %}Slideshow{% endtrans %}</title>
     <link href="{{ static('css/slideshow.scss') }}" rel="stylesheet" type="text/css" />
-    <script type="module" src="{{ static('bundled/jquery-index.js') }}"></script>
+    <script src="{{ static('bundled/vendored/jquery.min.js') }}"></script>
     <script src="{{ static('com/js/slideshow.js') }}"></script>
   </head>
   <body>
diff --git a/com/views.py b/com/views.py
index 1b7ab8bc..f9993b3c 100644
--- a/com/views.py
+++ b/com/views.py
@@ -685,8 +685,12 @@ class PosterEditBaseView(UpdateView):
 
     def get_initial(self):
         return {
-            "date_begin": self.object.date_begin.strftime("%Y-%m-%d %H:%M:%S"),
-            "date_end": self.object.date_end.strftime("%Y-%m-%d %H:%M:%S"),
+            "date_begin": self.object.date_begin.strftime("%Y-%m-%d %H:%M:%S")
+            if self.object.date_begin
+            else None,
+            "date_end": self.object.date_end.strftime("%Y-%m-%d %H:%M:%S")
+            if self.object.date_end
+            else None,
         }
 
     def dispatch(self, request, *args, **kwargs):
