Soldering iron problem

pLover

Apparently plover is a type of bird.
The cord end of my soldering iron (the end without the tip) keeps making this odd crackling sound. Is this normal/common? And either way, does it mean I should get a new one?
 
The tip's gotten a little wet before, but nothing major that I can remember.
 
Alright. I wanna be careful, though. Don't want it exploding in my hand. XD
 
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