diff --git a/kfet/views.py b/kfet/views.py
index 17de388e..8f5cdb3a 100644
--- a/kfet/views.py
+++ b/kfet/views.py
@@ -2324,7 +2324,9 @@ class AccountStatOperation(ScaleMixin, PkUrlMixin, JSONDetailView):
         scale = self.scale
 
         types = self.request.GET.get('types', None)
-        if types is not None:
+        if types is None:
+            types = []
+        else:
             types = ast.literal_eval(types)
 
         operations = self.get_operations(types=types, scale=scale)