diff --git a/worlds/messenger/__init__.py b/worlds/messenger/__init__.py
index 5d304edd1d9c..919bdba66f26 100644
--- a/worlds/messenger/__init__.py
+++ b/worlds/messenger/__init__.py
@@ -1,7 +1,7 @@
 import logging
 from typing import Dict, Any, Optional, List
 
-from BaseClasses import Tutorial, ItemClassification
+from BaseClasses import Tutorial, ItemClassification, MultiWorld
 from worlds.AutoWorld import World, WebWorld
 from .Constants import NOTES, PHOBEKINS, ALL_ITEMS, ALWAYS_LOCATIONS, SEALS, BOSS_LOCATIONS
 from .Options import messenger_options, NotesNeeded, Goal, PowerSeals, Logic
@@ -66,6 +66,13 @@ class MessengerWorld(World):
 
     total_seals: int = 0
     required_seals: int = 0
+    
+    @classmethod
+    def stage_assert_generate(cls, multiworld: MultiWorld) -> None:
+        for player in multiworld.get_game_players(cls.game):
+            player_name = multiworld.player_name[player] = multiworld.get_player_name(player).replace("_", " ")
+            if not all(c.isalnum() or c in "- " for c in player_name):
+                raise ValueError(f"Player name {player_name} is not alpha-numeric.")
 
     def generate_early(self) -> None:
         if self.multiworld.goal[self.player] == Goal.option_power_seal_hunt: