Reference from or to are empty: (ref_boot, ref_current)

[RiShinku]

Sometimes logcat catch the error message 'Reference from or to are empty: (ref_boot, ref_current)' in the main activity. I found this after remaining on main page and refreshing it, but cannot reproduce it every time.

[RiShinku]

Similarly, errors:
'Error: a Reading was instanciated with a null refFrom or refTo'
'Unknown bits set in runtime_flags: 0x8000'
'Notification [m_name=\xe5\xb0\x9a\xe6\x97\xa0\xe6\x95\xb0\xe6\x8d\xae\xe5\x8f\xaf\xe8\xa2\xab\xe6\x94\xb6\xe9\x9b\x86] is not of type Wakelock'
'substractFromRef error processing alarm items: ref can not have less items'
also been recorded, they all happened in the main Activity and setting activity, but I cannot reproduce them every time.