diff --git a/src/gui/PythonBridge/PythonBridge.qml b/src/gui/PythonBridge/PythonBridge.qml
index 2d0d5f47..8c82107a 100644
--- a/src/gui/PythonBridge/PythonBridge.qml
+++ b/src/gui/PythonBridge/PythonBridge.qml
@@ -21,13 +21,11 @@ Python {
         py.call(py.getattr(obj, "__setattr__"), [attr, value], callback)
     }
 
-
     function callCoro(name, args=[], onSuccess=null, onError=null) {
-        let uuid = name + "." + CppUtils.uuid()
+        const uuid   = name + "." + CppUtils.uuid()
+        const future = privates.makeFuture()
 
-        Globals.pendingCoroutines[uuid] = {onSuccess, onError}
-
-        let future = privates.makeFuture()
+        Globals.pendingCoroutines[uuid] = {future, onSuccess, onError}
 
         call("BRIDGE.call_backend_coro", [name, uuid, args], pyFuture => {
             future.privates.pythonFuture = pyFuture
@@ -36,18 +34,17 @@ Python {
         return future
     }
 
-
     function callClientCoro(
         accountId, name, args=[], onSuccess=null, onError=null
     ) {
-        let future = privates.makeFuture()
+        const future = privates.makeFuture()
 
         callCoro("get_client", [accountId], () => {
-            let uuid = accountId + "." + name + "." + CppUtils.uuid()
+            const uuid = accountId + "." + name + "." + CppUtils.uuid()
 
             Globals.pendingCoroutines[uuid] = {onSuccess, onError}
 
-            let call_args = [accountId, name, uuid, args]
+            const call_args = [accountId, name, uuid, args]
 
             call("BRIDGE.call_client_coro", call_args, pyFuture => {
                 future.privates.pythonFuture = pyFuture
@@ -57,15 +54,13 @@ Python {
         return future
     }
 
-
     function saveConfig(backend_attribute, data, callback=null) {
         if (! py.ready) { return }  // config not loaded yet
         return callCoro(backend_attribute + ".write", [data], callback)
     }
 
-
     function loadSettings(callback=null) {
-        let func = "load_settings"
+        const func = "load_settings"
 
         return callCoro(func, [], ([settings, uiState, history, theme]) => {
             window.settings = settings