diff --git a/models/behavior_analysis.py b/models/behavior_analysis.py
index fd10032..9b9e5bf 100644
--- a/models/behavior_analysis.py
+++ b/models/behavior_analysis.py
@@ -234,6 +234,7 @@ class BehaviorAnalysis:
             who_visit = getattr(self.event_tbl.c, visit_name)
 
         filters, _ = self.handler_filts(*self.events[0].get('filts'), g_f=False)
+        filters = filters or [1]
         selectd = [func.toStartOfDay(func.addHours(event_time_col, self.zone_time)).label('date'),
                    *self.groupby,
                    func.arrayDistinct(