Fix PWA callback assignment and error handling

misc/dist/html/editor.html

@@ -363,24 +363,28 @@ window.addEventListener('load', () => {
 		btn.style.display = '';
 	}
 	if ('serviceWorker' in navigator) {
-		navigator.serviceWorker.register('service.worker.js').then(function (reg) {
-			if (reg.waiting) {
-				notifyUpdate(reg.waiting);
-			}
-			reg.addEventListener('updatefound', function () {
-				const update = reg.installing;
-				update.addEventListener('statechange', function () {
-					if (update.state === 'installed') {
-						// It's a new install, claim and perform aggressive caching.
-						if (!reg.active) {
-							update.postMessage('claim');
-						} else {
-							notifyUpdate(update);
+		try {
+			navigator.serviceWorker.register('service.worker.js').then(function (reg) {
+				if (reg.waiting) {
+					notifyUpdate(reg.waiting);
+				}
+				reg.addEventListener('updatefound', function () {
+					const update = reg.installing;
+					update.addEventListener('statechange', function () {
+						if (update.state === 'installed') {
+							// It's a new install, claim and perform aggressive caching.
+							if (!reg.active) {
+								update.postMessage('claim');
+							} else {
+								notifyUpdate(update);
+							}
 						}
-					}
+					});
 				});
 			});
-		});
+		} catch (e) {
+			console.error('Error while registering service worker:', e);
+		}
 	}
 
 	const missing = Engine.getMissingFeatures({

misc/dist/html/full-size.html

@@ -152,9 +152,15 @@ const engine = new Engine(GODOT_CONFIG);
 
 	if (missing.length !== 0) {
 		if (GODOT_CONFIG['serviceWorker'] && GODOT_CONFIG['ensureCrossOriginIsolationHeaders'] && 'serviceWorker' in navigator) {
+			let serviceWorkerRegistrationPromise;
+			try {
+				serviceWorkerRegistrationPromise = navigator.serviceWorker.getRegistration();
+			} catch (err) {
+				serviceWorkerRegistrationPromise = Promise.reject(new Error('Service worker registration failed.'));
+			}
 			// There's a chance that installing the service worker would fix the issue
 			Promise.race([
-				navigator.serviceWorker.getRegistration().then((registration) => {
+				serviceWorkerRegistrationPromise.then((registration) => {
 					if (registration != null) {
 						return Promise.reject(new Error('Service worker already exists.'));
 					}