diff --git a/core/src.ts/web/examples/rnd_rndsig_validation.html b/core/src.ts/web/examples/rnd_rndsig_validation.html
index 3670b10..b0f5a73 100644
--- a/core/src.ts/web/examples/rnd_rndsig_validation.html
+++ b/core/src.ts/web/examples/rnd_rndsig_validation.html
@@ -60,6 +60,12 @@
LibHaLo Demo
const rnd = urlParams.get('rnd');
const rndsig = urlParams.get('rndsig');
+ // Check if pk2, rnd & rndsig parameters are present
+ if (!pk2 || !rnd || !rndsig) {
+ log("Please provide a URL with pk2, rnd & rndsig parameters");
+ return;
+ }
+
// Handle displaying/hiding the noArgsError message
if (!url) {
document