final try

src/components/Game.tsx

@@ -100,7 +100,7 @@ export default function Game() {
   console.log("game.playerDescriptions",game.playerDescriptions)
   console.log("game.world.players",game.world.players)
   const playerId = [...game.world.players.values()].find(
-    (p) => p.human === humanTokenIdentifier,
+    (p) => !!p && p.human === humanTokenIdentifier,
   )?.id;
   console.log("playerId",playerId)
 

src/components/PixiGame.tsx

@@ -32,7 +32,7 @@ export const PixiGame = (props: {
   const humanTokenIdentifier = useQuery(api.world.userStatus, { worldId: props.worldId, oauthToken }) ?? null;
   
   const humanPlayerId = [...props.game.world.players.values()].find(
-    (p) => props.game.playerDescriptions.get(p.id)?.name === humanTokenIdentifier,
+    (p) => !! p && p.human === humanTokenIdentifier,
   )?.id;
 
   const moveTo = useSendInput(props.engineId, 'moveTo');

src/components/PlayerDetails.tsx

@@ -37,7 +37,7 @@ export default function PlayerDetails({
   // Always select the other player if we're in a conversation with them.
   if (humanPlayer && humanConversation) {
     const otherPlayerIds = [...humanConversation.participants.keys()].filter(
-      (p) => p !== humanPlayer.id,
+      (p) => !!p && p !== humanPlayer.id,
     );
     playerId = otherPlayerIds[0];
   }