diff --git a/worlds/noita/__init__.py b/worlds/noita/__init__.py
index 499d202a..792b90e3 100644
--- a/worlds/noita/__init__.py
+++ b/worlds/noita/__init__.py
@@ -35,6 +35,10 @@ class NoitaWorld(World):
 
     web = NoitaWeb()
 
+    def generate_early(self):
+        if not self.multiworld.get_player_name(self.player).isascii():
+            raise Exception("Noita yaml's slot name has invalid character(s).")
+    
     # Returned items will be sent over to the client
     def fill_slot_data(self):
         return {name: getattr(self.multiworld, name)[self.player].value for name in self.option_definitions}
diff --git a/worlds/noita/docs/setup_en.md b/worlds/noita/docs/setup_en.md
index bd6a1514..b67e840b 100644
--- a/worlds/noita/docs/setup_en.md
+++ b/worlds/noita/docs/setup_en.md
@@ -40,6 +40,8 @@ or try restarting your game.
 ### What is a YAML and why do I need one?
 You can see the [basic multiworld setup guide](/tutorial/Archipelago/setup/en) here on the Archipelago website to learn
 about why Archipelago uses YAML files and what they're for.
+Please note that Noita only allows you to type certain characters for your slot name.
+These characters are: `` !#$%&'()+,-.0123456789;=@ABCDEFGHIJKLMNOPQRSTUVWXYZ[]^_`abcdefghijklmnopqrstuvwxyz{}~<>|\/``
 
 ### Where do I get a YAML?
 You can use the [game settings page for Noita](/games/Noita/player-settings) here on the Archipelago website to
@@ -54,4 +56,4 @@ Place the unzipped pack in the `packs` folder. Then, open Poptracker and open th
 Click on the "AP" symbol at the top, then enter the desired address, slot name, and password.
 
 That's all you need for it. It will provide you with a quick reference to see which checks you've done and
-which checks you still have left.
\ No newline at end of file
+which checks you still have left.