Further fixes; improve error handling

package-lock.json

@@ -8,6 +8,18 @@
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       "dev": true
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+    "@types/requestidlecallback": {
+      "version": "0.3.4",
+      "resolved": "https://registry.npmjs.org/@types/requestidlecallback/-/requestidlecallback-0.3.4.tgz",
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+      "dev": true
+    },
+    "@types/stats.js": {
+      "version": "0.17.0",
+      "resolved": "https://registry.npmjs.org/@types/stats.js/-/stats.js-0.17.0.tgz",
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+      "dev": true
+    },
     "preact": {
       "version": "10.5.14",
       "resolved": "https://registry.npmjs.org/preact/-/preact-10.5.14.tgz",