diff --git a/public/js/app.js b/public/js/app.js
index 614a409..9e137b6 100755
--- a/public/js/app.js
+++ b/public/js/app.js
@@ -4620,8 +4620,8 @@ class InstallManager {
 
     static async prompt(){
         if (Helper.isNotNull(this.deferredPromt)){
-            this.deferredPromt.prompt();
-            return this.deferredPromt.userChoice();
+            this.deferredPromt["prompt"]();
+            return this.deferredPromt["userChoice"];
         }
         return Promise.resolve({
             "outcome":"dismissed",
diff --git a/src/js/lib/pwa-assets.js b/src/js/lib/pwa-assets.js
index 9cf9022..5aebfdf 100755
--- a/src/js/lib/pwa-assets.js
+++ b/src/js/lib/pwa-assets.js
@@ -25,8 +25,8 @@ class InstallManager {
 
     static async prompt(){
         if (Helper.isNotNull(this.deferredPromt)){
-            this.deferredPromt.prompt();
-            return this.deferredPromt.userChoice();
+            this.deferredPromt["prompt"]();
+            return this.deferredPromt["userChoice"];
         }
         return Promise.resolve({
             "outcome":"dismissed",