Sparks when connecting MacBook Air charger to the wall

Hi everybody. Today when I plugged in the MacBook Air power charger to the wall in my room I saw and heard sparks for the first time and the I noticed that the connecter ends of the charger have burnt a little (I see small black dents) but the charger is working normally. Shall I stop using the charger and buy a new one? I mean does this have any effect on the Macbook?

then you indicate a grounding issue on a certain socket in your house.
You mentioned "connecter ends of the charger"
lets make sure, youre referring to the magsafe end that connects to the MAC, or to the 2 prong wall connector
which is it?
post a pic of the "small black dents"
otherwise use a regulated power strip in the location which has the faulty wall outlet you indicate.

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