Don't worry, it's not a horror film. Buster plays a bank teller that gets mistaken for robbery and then stows away in a faux haunted house meant to scare away people from the counterfeit operation inside.
The Haunted House is uneven because the jokes are hit and miss, but overall it's a fun experience. There are still some brilliant moments like the famous glue scene that is another borrowed gag from Buster's days with Fatty. But there are still a few dull moments and the story is a bit messy and hard to follow. But the entire experience is pretty fun and worth a look.