diff --git a/frontend/src/redux/session/klage/helpers.ts b/frontend/src/redux/session/klage/helpers.ts
index 5b3768c8..8f31741a 100644
--- a/frontend/src/redux/session/klage/helpers.ts
+++ b/frontend/src/redux/session/klage/helpers.ts
@@ -10,7 +10,7 @@ export const createSessionCase = (
   innsendingsytelse: Innsendingsytelse,
   internalSaksnummer: string | null,
 ): ISessionCase => ({
-  id: crypto.randomUUID(),
+  id: getId(),
   type,
   innsendingsytelse,
   foedselsnummer: '',
@@ -27,3 +27,19 @@ export const createSessionCase = (
   modifiedByUser: new Date().toISOString(),
   caseIsAtKA: null,
 });
+
+const SUPPORTS_CRYPTO =
+  'crypto' in window &&
+  typeof window.crypto === 'object' &&
+  window.crypto !== null &&
+  'getRandomValues' in window.crypto &&
+  typeof window.crypto.getRandomValues === 'function';
+
+const fallbackIdGenerator = (): `${string}-${string}` => {
+  const now = new Date().getTime();
+  const random = Math.random().toString(36).substring(2);
+
+  return `${now}-${random}`;
+};
+
+const getId = SUPPORTS_CRYPTO ? crypto.randomUUID : fallbackIdGenerator;