diff --git a/frontends/web/src/utils/qttransport.ts b/frontends/web/src/utils/qttransport.ts
index dd6e4e0e42..a4be6707cd 100644
--- a/frontends/web/src/utils/qttransport.ts
+++ b/frontends/web/src/utils/qttransport.ts
@@ -19,46 +19,36 @@ import { QWebChannel } from './qwebchannel';
 import { TMsgCallback, TQueryPromiseMap } from './transport-common';
 import { runningInQtWebEngine } from './env';
 
-let cache: any = null;
 let webChannel: any = null;
 let queryID: number = 0;
 const queryPromises: TQueryPromiseMap = {};
 const currentListeners: TMsgCallback[] = [];
 
-function initTransport() {
-  return new Promise((resolve, reject) => {
-    if (webChannel) {
-      resolve(webChannel);
-    } else if (cache) {
-      const check = function() {
-        if (webChannel) {
-          resolve(webChannel);
-        } else {
-          window.setTimeout(check, 1);
-        }
-      };
-      check();
-    } else if (runningInQtWebEngine()) {
-      const initWebChannel = function(channel: any) {
-        webChannel = channel;
-        webChannel.objects.backend.gotResponse.connect((
-          queryID: number,
-          response: string,
-        ) => {
-          queryPromises[queryID].resolve(JSON.parse(response));
-          delete queryPromises[queryID];
-        });
-        webChannel.objects.backend.pushNotify.connect((msg: string) => {
-          currentListeners.forEach(listener => listener(JSON.parse(msg)));
-        });
-        resolve(webChannel);
-
-      };
-      cache = new QWebChannel((window.qt!).webChannelTransport, initWebChannel);
-    } else {
-      reject();
-    }
-  });
+async function initTransport() {
+  if (!runningInQtWebEngine()) {
+    throw new Error('Must be running in Qt');
+  }
+  if (webChannel) {
+    return webChannel;
+  }
+  const initWebChannel = function(channel: any) {
+    channel.objects.backend.gotResponse.connect((
+      queryID: number,
+      response: string,
+    ) => {
+      queryPromises[queryID].resolve(JSON.parse(response));
+      delete queryPromises[queryID];
+    });
+    channel.objects.backend.pushNotify.connect((msg: string) => {
+      currentListeners.forEach(listener => listener(JSON.parse(msg)));
+    });
+    webChannel = channel;
+  };
+  new QWebChannel((window.qt!).webChannelTransport, initWebChannel);
+  while (!webChannel) {
+    await new Promise(r => setTimeout(r, 1));
+  }
+  return webChannel;
 }
 
 export function call(query: string) {