One of the “Slender Man stabbers” — who viciously ambushed and hacked a classmate when she was 12 years old in an effort to please a made-up internet boogeyman — has vanished, and cops are now hunting her.

Morgan Geyser, 23, cut off her ankle monitor and escaped from the group home where she living — and she’s currently on the run, according to cops in Madison, Wisconsin.

“Her whereabouts are unknown as of Sunday morning,” police said.

Geyser, along with her friend Anissa Weier, lured a fellow sixth-grade girl into a Waukesha, Wisconsin park in 2014 and stabbed her 19 times.

The attack was an effort to impress “Slender Man,” a supernatural character that rose to viral prominence on internet forums and was later the subject of a 2018 horror movie.

Miraculously, the victim survived the

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