“Slender Man” stabber Morgan Geyser could be sent back to a mental institution after authorities asked a court to revoke her conditional release following her escape from a Wisconsin group home last week.

On Wednesday, a Waukesha County Circuit Court judge agreed to seal the petition filed by the Department of Corrections late on Tuesday seeking to revoke the 23-year-old’s conditional release.

Geyser did not fight her extradition to Wisconsin during a Chicago court appearance Tuesday.

Wisconsin authorities now have 30 days to pick her up, according to a statement sent to The Post.

If her conditional release is revoked, she could be sent back to the Winnebago mental institution where she spent most of the past eight years.

She could also face fresh charges in connection with her escape

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