diff --git a/hooks/useSessionId.ts b/hooks/useSessionId.ts
index 3a14a5027..ebf32b812 100644
--- a/hooks/useSessionId.ts
+++ b/hooks/useSessionId.ts
@@ -3,8 +3,13 @@ import { v4 as uuidv4 } from "uuid"
 
 const storageKey = "sessionId"
 
-export function useSessionId(): string {
+export function useSessionId(): string | null {
   const sessionId = useMemo(() => {
+    if (typeof window === "undefined") {
+      // Return null if running on the server
+      return null
+    }
+
     let currentSessionId = sessionStorage.getItem(storageKey)
     if (!currentSessionId) {
       currentSessionId = uuidv4()
diff --git a/types/components/tracking.ts b/types/components/tracking.ts
index a4c9e30d5..1eb629a99 100644
--- a/types/components/tracking.ts
+++ b/types/components/tracking.ts
@@ -23,7 +23,7 @@ export type TrackingSDKPageData = {
   domain?: string
   siteSections: string
   pageLoadTime?: number // Page load time in seconds
-  sessionId?: string
+  sessionId?: string | null
 }
 
 export enum LoginTypeEnum {