Logcat error message - Attempted to destroy barrier with non zero count

I'm making an android app in Android Studio, integrating ParseCloud and when I try to retrieve some JSONObject from the cloud, I get this error message after step-debugging:

> 12-13 13:32:34.857 25631-25638/com.parse.starter A/art: art/runtime/barrier.cc:90] Check failed: count_ == 0 (count_=-1, 0=0) Attempted to destroy barrier with non zero count

> 12-13 13:32:34.858 25631-25638/com.parse.starter A/art: art/runtime/runtime.cc:366] Runtime aborting --- recursively, so no thread-specific detail!

> 12-13 13:32:34.863 25631-25638/com.parse.starter A/art: art/runtime/runtime.cc:366]

> 12-13 13:32:34.882 25631-25638/com.parse.starter A/libc: Fatal signal 6 (SIGABRT), code -6 in tid 25638 (JDWP)

Problem arises in this piece of code in ParseDecoder.java, precisely on the while line:

Map<String, Object> convertJSONObjectToMap(JSONObject object) {
    Map<String, Object> outputMap = new HashMap<>();
    Iterator<String> it = object.keys();
    while (it.hasNext()) {
      String key = it.next();
      Object value = object.opt(key);
      outputMap.put(key, decode(value));
    }
    return outputMap;
}

As I've seen while debugging, the object I wait for is created and is filled with one entry, but then this happens and I'm little bit lost... Any guidance will be great, thank you very much!