Problem with Proguard

In debug build this code executes fine

Art art = new Art(randomStore, nPrice, pictureCount,null, productId, posterId, posterPhone,posterWhatsApp,state,region,advertTitle,category, type, size,artTitle, description);

            // Create Post  in Art Cloud DB
            Backendless.Data.of(Art.class).save(art, new AsyncCallback<Art>() {

                @RequiresApi(api = Build.VERSION_CODES.O)
                public void handleResponse(Art object) {

                    //object saved


                public void handleFault(BackendlessFault fault) {

                    Log.e(getClass().getName(), "Save Fault:" + fault.toString()+fault.getMessage());


But when i enable proguard in release build i get this error

Fault:BackendlessFault{ code: ‘8001’, message: ‘Duplicate property: description’
I’ve checked my Table fields, they are all in order.Description field doesnt have any duplicate.

I already have this rule in my proguard file

-dontwarn com.backendless.** -dontwarn weborb.** -keep class weborb.** {;}
-keep class com.backendless.** {
Is there another rule i should be aware of?

Please, do not create duplicate topics.