v0.2.96

static/js/vendor-libs.js

@@ -19,8 +19,13 @@ function localAsset(path) {
 }
 
 function once(key, factory) {
-  if (!promiseCache.has(key)) promiseCache.set(key, Promise.resolve().then(factory));
-  return promiseCache.get(key);
+  if (promiseCache.has(key)) return promiseCache.get(key);
+  const promise = Promise.resolve().then(factory);
+  promiseCache.set(key, promise);
+  promise.catch(() => {
+    if (promiseCache.get(key) === promise) promiseCache.delete(key);
+  });
+  return promise;
 }
 
 function loadClassicScript(path, globalName) {