Electric shock to the lighting cable

There could be a number of reasons that you can receive an electrical shock.

Those can be:

• An improperly grounded electrical outlet. / Check the outlet.
• A defective lightning to USB cable. / Try another cable.
• The power adapter is defective. / Try another adapter.

sure if it's under warranty

Legal - Hardware Warranties - Apple

for it to really shock you the ac charger pretty much has to leak 230/110 ac power which is rather dangerous both for people and for the ios devices so if it was me then I would not use it again

If you purchased this adapter within the 14 days, you should be able to return it for either a full refund or a replacement. After that, the Apple Technician would have to determine that it is a manufacturing defect. Otherwise, you can certainly get another one at your cost.

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We want to make sure you reach the right team for help with your device. We recommend that you contact Apple Support directly. Depending on your region, you may be able to reach them here: Get Support.