diff --git a/e2e/build-block.test.ts b/e2e/build-block.test.ts
index f9852ec8..6bc0aaea 100644
--- a/e2e/build-block.test.ts
+++ b/e2e/build-block.test.ts
@@ -4,7 +4,7 @@ import { setupAll } from './helper'
 
 describe.each([
   { chain: 'Polkadot', endpoint: 'wss://rpc.polkadot.io' },
-  { chain: 'Kusama', endpoint: 'wss://kusama-rpc.dwellir.com' },
+  { chain: 'Kusama', endpoint: 'wss://kusama.api.onfinality.io/public-ws' },
   { chain: 'Acala', endpoint: 'wss://acala-rpc-1.aca-api.network' },
 ])('Latest $chain can build blocks', async ({ endpoint }) => {
   const { setup, teardownAll } = await setupAll({ endpoint })
diff --git a/template/diff.html b/template/diff.html
index 7dcfb2d4..d543e487 100644
--- a/template/diff.html
+++ b/template/diff.html
@@ -108,7 +108,7 @@
 				}
 
 				function renderDelta(value) {
-					if (/^\d+(,\d+)*$/.test(value[1])) {
+					if (/^\d+(,\d+)*$/.test(value[0]) && /^\d+(,\d+)*$/.test(value[1])) {
 						const oldValue = parseInt(value[0].replace(/,/g, ''))
 						const newValue = parseInt(value[1].replace(/,/g, ''))
 						if (oldValue > 0 && newValue > 0) {