diff --git a/src/targets/services/aggregatorUsageEvents.ts b/src/targets/services/aggregatorUsageEvents.ts
index d81db3da6a8a5fb1af982d409f88d21033787aa7..9139d35fc6ff566b0338ee26bae807c9693aff89 100644
--- a/src/targets/services/aggregatorUsageEvents.ts
+++ b/src/targets/services/aggregatorUsageEvents.ts
@@ -258,6 +258,7 @@ const calculPeriodBetweenFirstConnectionAndFirstChallenge = async (
       group1: { start_event: 'first_session' },
       // eslint-disable-next-line @typescript-eslint/camelcase
       group2: { end_event: 'first_challenge' },
+      group3: { params: '' },
     }
     const result = await sendIndicator(periodIndicator, client)
     if (result) {