diff --git a/MultiServer.py b/MultiServer.py
index 21aee68a..258b73c6 100644
--- a/MultiServer.py
+++ b/MultiServer.py
@@ -761,7 +761,7 @@ async def on_client_connected(ctx: Context, client: Client):
         'datapackage_versions': {game: game_data["version"] for game, game_data
                                  in ctx.gamespackage.items() if game in games},
         'datapackage_checksums': {game: game_data["checksum"] for game, game_data
-                                  in ctx.gamespackage.items() if game in games},
+                                  in ctx.gamespackage.items() if game in games and "checksum" in game_data},
         'seed_name': ctx.seed_name,
         'time': time.time(),
     }])
diff --git a/WebHostLib/customserver.py b/WebHostLib/customserver.py
index fa392492..b34e1961 100644
--- a/WebHostLib/customserver.py
+++ b/WebHostLib/customserver.py
@@ -94,7 +94,7 @@ class WebHostContext(Context):
 
         multidata = self.decompress(room.seed.multidata)
         game_data_packages = {}
-        for game in list(multidata["datapackage"]):
+        for game in list(multidata.get("datapackage", {})):
             game_data = multidata["datapackage"][game]
             if "checksum" in game_data:
                 if self.gamespackage.get(game, {}).get("checksum") == game_data["checksum"]:
@@ -102,8 +102,9 @@ class WebHostContext(Context):
                     # games package could be dropped from static data once all rooms embed data package
                     del multidata["datapackage"][game]
                 else:
-                    data = Utils.restricted_loads(GameDataPackage.get(checksum=game_data["checksum"]).data)
-                    game_data_packages[game] = data
+                    row = GameDataPackage.get(checksum=game_data["checksum"])
+                    if row:  # None if rolled on >= 0.3.9 but uploaded to <= 0.3.8. multidata should be complete
+                        game_data_packages[game] = Utils.restricted_loads(row.data)
 
         return self._load(multidata, game_data_packages, True)