Bad sign of #SingaporeElection 
... Dereference of null pointer https://t.co/0kGjhVPWA5
<a href="http://twitter.com/download/android" rel="nofollow">Twitter for Android</a>
Kent Ridge MRT Station (CC24)
[]
NATIONAL UNIVERSITY OF S'PORE
ChIJsZVxG7Ub2jERjx6oDg_pAhw
['bad', 'sign', '#singaporeelection', '...', 'dereference', 'null', 'pointer', 'https://t.co/0kgjhvpwa5']
['bad', 'bad', 'bad', 'bad', 'bad']
sign #singaporeelection null pointer
bad sign singaporeelection dereference null pointer
  [
    {"relatedness": False, "type": "none", "explanation": "This is not related to public housing or maintenance issues."},
    ]

It seems that the Twitter post you provided does not relate to a maintenance report feedback to public flat house in Singapore. The term "dereference null pointer" suggests that the post may be related to a technical or programming issue, rather than a maintenance report. Therefore, the answer is "relatedness": False, "type": "none", and "explanation": "This is not related to public housing or maintenance issues."