diff --git a/engine/apps/alerts/models/alert_group.py b/engine/apps/alerts/models/alert_group.py
index 2b7659c5..8a00fb83 100644
--- a/engine/apps/alerts/models/alert_group.py
+++ b/engine/apps/alerts/models/alert_group.py
@@ -74,7 +74,7 @@ class AlertGroupQuerySet(models.QuerySet):
         # Try to return the last open group
         # Note that (channel, channel_filter, distinction, is_open_for_grouping) is in unique_together
         try:
-            return self.get(**search_params, is_open_for_grouping=True), False
+            return self.get(**search_params, is_open_for_grouping__isnull=False), False
         except self.model.DoesNotExist:
             pass