Firebase AndroidChat release build error

I implemented a new chat feature for our app using the Firebase androidchat as a template. Everything is working great, no error whatsoever, until I try the release build.

*com.firebase.client.FirebaseException: Failed to bounce to type*

There's one similar question in stackoverflow but it appears the guy managed to fix it by correcting spelling errors within his class. I have none of those and like I said, dev build has no errors.

Here is my class:

public class Chat {

private String message;
private String author;
private String profilePic;
private Long creationDate;
private Boolean god;

// Required default constructor for Firebase object mapping
@SuppressWarnings("unused")
private Chat() {

}

public Chat(String message, String author, String profilePic, Long creationDate, Boolean god) {
    this.message = message;
    this.author = author;
    this.profilePic = profilePic;
    this.creationDate = creationDate;
    this.god = god;
}

public String getMessage() {
    return message;
}

public String getAuthor() {
    return author;
}

public String getProfilePic() {
    return profilePic;
}

public Long getCreationDate() {
    return creationDate;
}

public Boolean getGod() {
    return god;
}
}

And here's how it looks like in Firebase console http://ift.tt/172uHvL

Here's the full error if it helps: http://ift.tt/1vHWrBJ

If I remove "creationDate" it will just say "Unrecognized field message" which is also one of the class properties.

Has anyone tried the Release Build of Firebase Android Chat?