diff --git a/www/cache.js b/www/cache.js
index 812062c..29760a0 100644
--- a/www/cache.js
+++ b/www/cache.js
@@ -126,6 +126,8 @@ for (i in SETTINGS.weathericons) {
     cachedurls.push("assets/images/weather-" + SETTINGS.weathericons[i] + ".svg");
 }
 
+var cacheFilled = false;
+
 function fillCache(cachename) {
     if ('caches' in window) {
         // delete old caches
@@ -137,15 +139,22 @@ function fillCache(cachename) {
             }));
         });
 
+        cacheFilled = true; // assume good
         caches.open(cachename).then(function (cache) {
             for (i in cachedurls) {
-                cache.add(cachedurls[i]);
+                try {
+                    cache.add(cachedurls[i]);
+                } catch (ex) {
+                    cacheFilled = false;
+                }
             }
         });
 
-        // Do it again in a little while to reduce chance of errors
-        setTimeout(function () {
-            fillCache(cachename);
-        }, 1000 * 30);
+        // Do it again in a little while
+        if (!cacheFilled) {
+            setTimeout(function () {
+                fillCache(cachename);
+            }, 1000 * 30);
+        }
     }
 }
\ No newline at end of file
diff --git a/www/index.html b/www/index.html
index 210dfd8..0ef2e31 100644
--- a/www/index.html
+++ b/www/index.html
@@ -69,7 +69,9 @@
 <script src="cache.js"></script>
 
 <script>
-    fillCache(SETTINGS.cacheversion);
+    if (platform_type == "browser") {
+        fillCache(SETTINGS.cacheversion);
+    }
     if ('serviceWorker' in navigator) {
         navigator.serviceWorker.register('sw.js').then(function (registration) {
             console.log('Service worker registration succeeded:', registration);
diff --git a/www/settings.js b/www/settings.js
index bf99429..373c2a9 100644
--- a/www/settings.js
+++ b/www/settings.js
@@ -5,7 +5,7 @@
  */
 
 var SETTINGS = {
-    cacheversion: "v1.4.0_3",
+    cacheversion: "v1.4.0_4",
     maptileurls: {
         liberty: {
             url: "https://maps.netsyms.net/styles/osm-liberty/{z}/{x}/{y}.png",
diff --git a/www/sw.js b/www/sw.js
index b01da90..93062e3 100644
--- a/www/sw.js
+++ b/www/sw.js
@@ -4,29 +4,33 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
  */
 
-var cachename = "v1.4.0_3";
+var cachename = "v1.4.0_4";
 
 self.addEventListener('fetch', (event) => {
     event.respondWith(
             caches.match(event.request).then((resp) => {
         return resp || fetch(event.request).then((response) => {
             return caches.open(cachename).then((cache) => {
-                cache.put(event.request, response.clone());
+                try {
+                    cache.put(event.request, response.clone());
+                } catch (ex) {
+
+                }
                 return response;
             });
         });
     })
             );
 });
-
-self.addEventListener('install', function (event) {
-    event.waitUntil(
-            caches.open(cachename).then((cache) => {
-        return cache.addAll([
-            "https://maps.netsyms.net/styles/osm-liberty/style.json",
-            "https://maps.netsyms.net/styles/klokantech-terrain/style.json",
-            "https://maps.netsyms.net/styles/fiord-color/style.json",
-            "https://maps.netsyms.net/styles/oled-black/style.json"
-        ]);
-    }));
-});
\ No newline at end of file
+//
+//self.addEventListener('install', function (event) {
+//    event.waitUntil(
+//            caches.open(cachename).then((cache) => {
+//        return cache.addAll([
+//            "https://maps.netsyms.net/styles/osm-liberty/style.json",
+//            "https://maps.netsyms.net/styles/klokantech-terrain/style.json",
+//            "https://maps.netsyms.net/styles/fiord-color/style.json",
+//            "https://maps.netsyms.net/styles/oled-black/style.json"
+//        ]);
+//    }));
+//});
\ No newline at end of file