Concur with highly likely NOT a safety issue. If you want to address the pop (if it annoys etc), two things to try:
1) a good surge suppressor on the stereo might help filter any direct power spikes.
2) Very possible the switch on the wall is "bad", not bad enough to not work, but bad enough to create RF interference. Changing out the wall switch might solve issue. NOTE, I would not call a safety issue unless the switch is not operating reliably in the on and/or off position.
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