diff --git a/competition/filters.py b/competition/filters.py
index 9d0d104..48ab451 100644
--- a/competition/filters.py
+++ b/competition/filters.py
@@ -5,6 +5,8 @@
 
 class UpcomingFilter(BooleanFilter):
     def filter(self, qs: BaseManager, value: bool):
+        if value is None:
+            return qs
         lookup_expr = 'gte' if value else 'lte'
         lookup = '__'.join([self.field_name, lookup_expr])
         return qs.filter(**{lookup: now()})