diff --git a/src/server/BreCal/database/sql_handler.py b/src/server/BreCal/database/sql_handler.py
index 59497e3..537dd65 100644
--- a/src/server/BreCal/database/sql_handler.py
+++ b/src/server/BreCal/database/sql_handler.py
@@ -261,6 +261,9 @@ class SQLHandler():
         filtered_series = self.filter_df_by_participant_type(df_times, participant_type)
         #filtered_series = df_times.loc[df_times["participant_type"]==participant_type]
 
+        if len(filtered_series)==0:
+            return None
+
         if len(filtered_series)==0:
             return None