diff --git a/js/pollTransaction.worker.js b/js/pollTransaction.worker.js
index 1d1400d..9e08582 100644
--- a/js/pollTransaction.worker.js
+++ b/js/pollTransaction.worker.js
@@ -18,20 +18,15 @@ self.addEventListener('message', function (e)
             {
                 setInterval(function ()
                 {
-                    const request = new XMLHttpRequest();
-
-                    request.open("GET", url + "?" + params, false);
-
-                    request.onload = (e) =>
-                    {
-                        try
+                    fetch(url + "?" + params, {method: 'GET'})
+                        .then(r =>
                         {
-                            if (request.readyState === 4)
+                            if (r.ok)
                             {
-                                if (request.status === 200)
+                                r.text().then(result =>
                                 {
-                                    const response = JSON.parse(request.response);
-                                    if (response['result']['authentication'] === "ACCEPT")
+                                    const resultJson = JSON.parse(result);
+                                    if (resultJson['result']['authentication'] === "ACCEPT")
                                     {
                                         self.postMessage({
                                             'message': 'Polling in browser: Push message confirmed!',
@@ -39,28 +34,20 @@ self.addEventListener('message', function (e)
                                         });
                                         self.close();
                                     }
-                                }
-                                else
-                                {
-                                    self.postMessage({'message': request.statusText, 'status': 'error'});
-                                    self.close();
-                                }
+                                });
                             }
-                        }
-                        catch (e)
-                        {
-                            self.postMessage({'message': e, 'status': 'error'});
-                            self.close();
-                        }
-                    };
-
-                    request.onerror = (e) =>
-                    {
-                        self.postMessage({'message': request.statusText, 'status': 'error'});
-                        self.close();
-                    };
-
-                    request.send();
+                            else
+                            {
+                                self.postMessage({'message': r.statusText, 'status': 'error'});
+                                self.close();
+                            }
+                        })
+                        .catch(e =>
+                            {
+                                self.postMessage({'message': e, 'status': 'error'});
+                                self.close();
+                            }
+                        );
                 }, 300);
             }
             break;
diff --git a/lib/Provider/PrivacyIDEAProvider.php b/lib/Provider/PrivacyIDEAProvider.php
index dbce268..b54d17a 100644
--- a/lib/Provider/PrivacyIDEAProvider.php
+++ b/lib/Provider/PrivacyIDEAProvider.php
@@ -91,31 +91,34 @@ public function getTemplate(IUser $user): Template
 
         if ($authenticationFlow === "piAuthFlowTriggerChallenge")
         {
-            if (!$this->pi->serviceAccountAvailable())
+            if (!empty($this->pi))
             {
-                $this->log("error", "Service account name or password is not set in config. Cannot trigger the challenges.");
-            }
-            else
-            {
-                if ($this->session->get("piTriggerChallengeDone") !== true)
+                if (!$this->pi->serviceAccountAvailable())
                 {
-                    try
+                    $this->log("error", "Service account name or password is not set in config. Cannot trigger the challenges.");
+                }
+                else
+                {
+                    if ($this->session->get("piTriggerChallengeDone") !== true)
                     {
-                        $response = $this->pi->triggerChallenge($username, $headers);
-                        $this->session->set("piTriggerChallengeDone", true);
-                        if ($response !== null)
+                        try
                         {
-                            $this->processPIResponse($response);
+                            $response = $this->pi->triggerChallenge($username, $headers);
+                            $this->session->set("piTriggerChallengeDone", true);
+                            if ($response !== null)
+                            {
+                                $this->processPIResponse($response);
+                            }
+                            else
+                            {
+                                $this->log("error", "No response from privacyIDEA server for triggerchallenge.");
+                            }
                         }
-                        else
+                        catch (PIBadRequestException $e)
                         {
-                            $this->log("error", "No response from privacyIDEA server for triggerchallenge.");
+                            $this->handlePIException($e);
                         }
                     }
-                    catch (PIBadRequestException $e)
-                    {
-                        $this->handlePIException($e);
-                    }
                 }
             }
         }
diff --git a/package.json b/package.json
index ee914cd..ff89edb 100644
--- a/package.json
+++ b/package.json
@@ -16,9 +16,7 @@
     "extends @nextcloud/browserslist-config"
   ],
   "dependencies": {
-    "@nextcloud/router": "^3.0.1",
-    "@nextcloud/vue": "^8.11.2",
-    "vue": "^2.7.16"
+    "@nextcloud/router": "^3.0.1"
   },
   "devDependencies": {
     "@nextcloud/browserslist-config": "^3.0.1",