'Android Key/Value backup: SKIP_PADDING FAILED

Using Android backup API Key/Value backup, I get:

D/backup_data: SKIP_PADDING FAILED at line 334

on onRestore while simply backing up / restoring a sharedPrefs that looks like this:

<?xml version='1.0' encoding='utf-8' standalone='yes' ?>
<map>
    <boolean name="is_migrated" value="true" />
</map>

Is this warning (or error) safe to ignore? Restore seems to work otherwise...

I assume warning has something to do with BaseX encoding in Android, but I can't see what is wrong with my sharedPrefs... I am on Android Lollipop.

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