diff --git a/sdk/feature-management-applicationinsights-browser/src/telemetry.ts b/sdk/feature-management-applicationinsights-browser/src/telemetry.ts
index 50130ca..10b1c76 100644
--- a/sdk/feature-management-applicationinsights-browser/src/telemetry.ts
+++ b/sdk/feature-management-applicationinsights-browser/src/telemetry.ts
@@ -47,6 +47,6 @@ export function createTelemetryPublisher(client: ApplicationInsights): (event: E
 export function trackEvent(client: ApplicationInsights, targetingId: string, event: IEventTelemetry, customProperties?: {[key: string]: any}): void {
     const properties = customProperties ? { ...customProperties } : {};
     // Ensure targetingId is string so that it will be placed in customDimensions
-    properties["TargetingId"] = targetingId?.toString();
+    properties["TargetingId"] = targetingId ? targetingId.toString() : "";
     client.trackEvent(event, properties);
 }