Error: TypeError: Cannot read property 'then' of undefined

[#1]

I was reloading data within my app in Qlik Sense Desktop when it froze and I had to close it. Now, everytime I try to open my app it keeps loading but nothing is shown. Other apps are loading fine.

I found this exception in QlikSenseBrowser log files:

2017-03-13 14:52:47:273 ora solare Europa occidentale [INFO] CEF Console - TypeError: Cannot read property 'then' of undefined

    at Object.get (http://localhost:4848/resources/assets/client/client.js??1481126454213:26:11029)

    at Object.j [as showDialog] (http://localhost:4848/resources/assets/client/client.js??1481126454213:26:15530)

    at http://localhost:4848/resources/assets/client/client.js??1481126454213:28:2851

    at g (http://localhost:4848/resources/assets/external/requirejs/require.js?1481126454213:45:4586)

    at http://localhost:4848/resources/assets/external/requirejs/require.js?1481126454213:45:4758

    at o.$eval (http://localhost:4848/resources/assets/external/requirejs/require.js?1481126454213:45:12399)

    at o.$digest (http://localhost:4848/resources/assets/external/requirejs/require.js?1481126454213:45:10885)

    at http://localhost:4848/resources/assets/external/requirejs/require.js?1481126454213:45:12486

    at f (http://localhost:4848/resources/assets/external/requirejs/require.js?1481126454213:43:22668)

    at http://localhost:4848/resources/assets/external/requirejs/require.js?1481126454213:43:24130  (Line 44 of http://localhost:4848/resources/assets/external/requirejs/require.js?1481126454213)

I'm using Qlik Sense v 3.1 SR4 (qliksensedesktop:10.7.3).

Any idea?!

Thanks!