Charger leakage, there are two main reasons, the first is wire aging. The charging cable inside makes contact with the housing. Especially when the inner shield is connected to the power cord that's still alive it causes a little leakage. Or maybe there's water in the charger. The insulation inside will be reduced and people will be electrocuted.
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Of course, sometimes you touch it will be numb, not necessarily leakage, it may be caused by the static electricity or induction of the human body, you can use the test pen to try, this charger is not expensive, in order to safety it is recommended that you still change another or your heart will not be comfortable.