diff --git a/queries/analytics/event/saveEvent.ts b/queries/analytics/event/saveEvent.ts
index 2dcb8849..9a7db00d 100644
--- a/queries/analytics/event/saveEvent.ts
+++ b/queries/analytics/event/saveEvent.ts
@@ -137,7 +137,7 @@ async function clickhouseQuery(data: {
     session_id: sessionId,
     event_id: eventId,
     country: country ? country : null,
-    subdivision1: subdivision1 ? country.concat('-', subdivision1) : null,
+    subdivision1: country && subdivision1 ? `${country}-${subdivision1}` : null,
     subdivision2: subdivision2 ? subdivision2 : null,
     city: city ? city : null,
     url_path: urlPath?.substring(0, URL_LENGTH),
diff --git a/queries/analytics/session/createSession.ts b/queries/analytics/session/createSession.ts
index 4014ac41..22f7892f 100644
--- a/queries/analytics/session/createSession.ts
+++ b/queries/analytics/session/createSession.ts
@@ -44,7 +44,7 @@ async function relationalQuery(data: Prisma.SessionCreateInput) {
       screen,
       language,
       country,
-      subdivision1: subdivision1 ? country.concat('-', subdivision1) : null,
+      subdivision1: country && subdivision1 ? `${country}-${subdivision1}` : null,
       subdivision2,
       city,
     },