Java Static Variable becomes null
<p>I have an android java class with a static instance holding info on a user. However, in some rare cases with a user using my app, one of the variables within that static instance becomes null after a while. This java class is global (not attached to any activity). What could be causing this?</p>

<p>EDIT: The variable is never changed except during the startup of the app. I've already checked that the function calling it will never be called more than once (the adb logcat proves that when I added a log stating that it is being called).</p>

<p>The code is something like this:</p>

<pre><code>class UserCore
{
    class UserData
    {
        int ID;
        string Name;
    }

    public UserData User;
    public static UserCore Instance = new UserCore();

    public void Login()
    {
        Log.d("User", "Logging in");
        new Throwable().printStackTrace();

        User = null;
        //Fetch user data
        User = new UserData();
        User.ID = ...
        User.Name = ...
    }
    ....
}
</code></pre>
